agora inbox for [email protected]help / color / mirror / Atom feed
[PATCH v19 6/8] Row pattern recognition patch (docs). 264+ messages / 2 participants [nested] [flat]
* [PATCH v19 6/8] Row pattern recognition patch (docs). @ 2024-05-14 23:26 Tatsuo Ishii <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Tatsuo Ishii @ 2024-05-14 23:26 UTC (permalink / raw) --- doc/src/sgml/advanced.sgml | 82 ++++++++++++++++++++++++++++++++++++ doc/src/sgml/func.sgml | 54 ++++++++++++++++++++++++ doc/src/sgml/ref/select.sgml | 38 ++++++++++++++++- 3 files changed, 172 insertions(+), 2 deletions(-) diff --git a/doc/src/sgml/advanced.sgml b/doc/src/sgml/advanced.sgml index 755c9f1485..b0b1d1c51e 100644 --- a/doc/src/sgml/advanced.sgml +++ b/doc/src/sgml/advanced.sgml @@ -537,6 +537,88 @@ WHERE pos < 3; <literal>rank</literal> less than 3. </para> + <para> + Row pattern common syntax can be used to perform row pattern recognition + in a query. The row pattern common syntax includes two sub + clauses: <literal>DEFINE</literal> + and <literal>PATTERN</literal>. <literal>DEFINE</literal> defines + definition variables along with an expression. The expression must be a + logical expression, which means it must + return <literal>TRUE</literal>, <literal>FALSE</literal> + or <literal>NULL</literal>. The expression may comprise column references + and functions. Window functions, aggregate functions and subqueries are + not allowed. An example of <literal>DEFINE</literal> is as follows. + +<programlisting> +DEFINE + LOWPRICE AS price <= 100, + UP AS price > PREV(price), + DOWN AS price < PREV(price) +</programlisting> + + Note that <function>PREV</function> returns the price column in the + previous row if it's called in a context of row pattern recognition. Thus in + the second line the definition variable "UP" is <literal>TRUE</literal> + when the price column in the current row is greater than the price column + in the previous row. Likewise, "DOWN" is <literal>TRUE</literal> when when + the price column in the current row is lower than the price column in the + previous row. + </para> + <para> + Once <literal>DEFINE</literal> exists, <literal>PATTERN</literal> can be + used. <literal>PATTERN</literal> defines a sequence of rows that satisfies + certain conditions. For example following <literal>PATTERN</literal> + defines that a row starts with the condition "LOWPRICE", then one or more + rows satisfy "UP" and finally one or more rows satisfy "DOWN". Note that + "+" means one or more matches. Also you can use "*", which means zero or + more matches. If a sequence of rows which satisfies the PATTERN is found, + in the starting row of the sequence of rows all window functions and + aggregates are shown in the target list. Note that aggregations only look + into the matched rows, rather than whole frame. On the second or + subsequent rows all window functions are NULL. Aggregates are NULL or 0 + (count case) depending on its aggregation definition. For rows that do not + match on the PATTERN, all window functions and aggregates are shown AS + NULL too, except count showing 0. This is because the rows do not match, + thus they are in an empty frame. Example of a <literal>SELECT</literal> + using the <literal>DEFINE</literal> and <literal>PATTERN</literal> clause + is as follows. + +<programlisting> +SELECT company, tdate, price, + first_value(price) OVER w, + max(price) OVER w, + count(price) OVER w +FROM stock + WINDOW w AS ( + PARTITION BY company + ORDER BY tdate + ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING + AFTER MATCH SKIP PAST LAST ROW + INITIAL + PATTERN (LOWPRICE UP+ DOWN+) + DEFINE + LOWPRICE AS price <= 100, + UP AS price > PREV(price), + DOWN AS price < PREV(price) +); +</programlisting> +<screen> + company | tdate | price | first_value | max | count +----------+------------+-------+-------------+-----+------- + company1 | 2023-07-01 | 100 | 100 | 200 | 4 + company1 | 2023-07-02 | 200 | | | 0 + company1 | 2023-07-03 | 150 | | | 0 + company1 | 2023-07-04 | 140 | | | 0 + company1 | 2023-07-05 | 150 | | | 0 + company1 | 2023-07-06 | 90 | 90 | 130 | 4 + company1 | 2023-07-07 | 110 | | | 0 + company1 | 2023-07-08 | 130 | | | 0 + company1 | 2023-07-09 | 120 | | | 0 + company1 | 2023-07-10 | 130 | | | 0 +(10 rows) +</screen> + </para> + <para> When a query involves multiple window functions, it is possible to write out each one with a separate <literal>OVER</literal> clause, but this is diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 17c44bc338..8dbab31300 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -23124,6 +23124,7 @@ SELECT count(*) FROM sometable; returns <literal>NULL</literal> if there is no such row. </para></entry> </row> + </tbody> </tgroup> </table> @@ -23163,6 +23164,59 @@ SELECT count(*) FROM sometable; Other frame specifications can be used to obtain other effects. </para> + <para> + Row pattern recognition navigation functions are listed in + <xref linkend="functions-rpr-navigation-table"/>. These functions + can be used to describe DEFINE clause of Row pattern recognition. + </para> + + <table id="functions-rpr-navigation-table"> + <title>Row Pattern Navigation Functions</title> + <tgroup cols="1"> + <thead> + <row> + <entry role="func_table_entry"><para role="func_signature"> + Function + </para> + <para> + Description + </para></entry> + </row> + </thead> + + <tbody> + <row> + <entry role="func_table_entry"><para role="func_signature"> + <indexterm> + <primary>prev</primary> + </indexterm> + <function>prev</function> ( <parameter>value</parameter> <type>anyelement</type> ) + <returnvalue>anyelement</returnvalue> + </para> + <para> + Returns the column value at the previous row; + returns NULL if there is no previous row in the window frame. + </para></entry> + </row> + + <row> + <entry role="func_table_entry"><para role="func_signature"> + <indexterm> + <primary>next</primary> + </indexterm> + <function>next</function> ( <parameter>value</parameter> <type>anyelement</type> ) + <returnvalue>anyelement</returnvalue> + </para> + <para> + Returns the column value at the next row; + returns NULL if there is no next row in the window frame. + </para></entry> + </row> + + </tbody> + </tgroup> + </table> + <note> <para> The SQL standard defines a <literal>RESPECT NULLS</literal> or diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml index 066aed44e6..8f18718d58 100644 --- a/doc/src/sgml/ref/select.sgml +++ b/doc/src/sgml/ref/select.sgml @@ -969,8 +969,8 @@ WINDOW <replaceable class="parameter">window_name</replaceable> AS ( <replaceabl The <replaceable class="parameter">frame_clause</replaceable> can be one of <synopsis> -{ RANGE | ROWS | GROUPS } <replaceable>frame_start</replaceable> [ <replaceable>frame_exclusion</replaceable> ] -{ RANGE | ROWS | GROUPS } BETWEEN <replaceable>frame_start</replaceable> AND <replaceable>frame_end</replaceable> [ <replaceable>frame_exclusion</replaceable> ] +{ RANGE | ROWS | GROUPS } <replaceable>frame_start</replaceable> [ <replaceable>frame_exclusion</replaceable> ] [row_pattern_common_syntax] +{ RANGE | ROWS | GROUPS } BETWEEN <replaceable>frame_start</replaceable> AND <replaceable>frame_end</replaceable> [ <replaceable>frame_exclusion</replaceable> ] [row_pattern_common_syntax] </synopsis> where <replaceable>frame_start</replaceable> @@ -1077,6 +1077,40 @@ EXCLUDE NO OTHERS a given peer group will be in the frame or excluded from it. </para> + <para> + The + optional <replaceable class="parameter">row_pattern_common_syntax</replaceable> + defines the <firstterm>row pattern recognition condition</firstterm> for + this + window. <replaceable class="parameter">row_pattern_common_syntax</replaceable> + includes following subclauses. <literal>AFTER MATCH SKIP PAST LAST + ROW</literal> or <literal>AFTER MATCH SKIP TO NEXT ROW</literal> controls + how to proceed to next row position after a match + found. With <literal>AFTER MATCH SKIP PAST LAST ROW</literal> (the + default) next row position is next to the last row of previous match. On + the other hand, with <literal>AFTER MATCH SKIP TO NEXT ROW</literal> next + row position is always next to the last row of previous + match. <literal>DEFINE</literal> defines definition variables along with a + boolean expression. <literal>PATTERN</literal> defines a sequence of rows + that satisfies certain conditions using variables defined + in <literal>DEFINE</literal> clause. If the variable is not defined in + the <literal>DEFINE</literal> clause, it is implicitly assumed + following is defined in the <literal>DEFINE</literal> clause. + +<synopsis> +<literal>variable_name</literal> AS TRUE +</synopsis> + + Note that the maximu number of variables defined + in <literal>DEFINE</literal> clause is 26. + +<synopsis> +[ AFTER MATCH SKIP PAST LAST ROW | AFTER MATCH SKIP TO NEXT ROW ] +PATTERN <replaceable class="parameter">pattern_variable_name</replaceable>[+] [, ...] +DEFINE <replaceable class="parameter">definition_varible_name</replaceable> AS <replaceable class="parameter">expression</replaceable> [, ...] +</synopsis> + </para> + <para> The purpose of a <literal>WINDOW</literal> clause is to specify the behavior of <firstterm>window functions</firstterm> appearing in the query's -- 2.25.1 ----Next_Part(Wed_May_15_09_02_03_2024_008)-- Content-Type: Text/X-Patch; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="v19-0007-Row-pattern-recognition-patch-tests.patch" ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing @ 2025-10-17 11:55 Álvaro Herrera <[email protected]> 0 siblings, 0 replies; 264+ messages in thread From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw) Previously, a lot of code would be run in the ProcessUtility pipeline, where it is not welcome (that's supposed to be just a giant dispatcher switch). Move the parse analysis code to CreateStatistics() instead, which then means we don't need to open the relation twice; it also allows us to give a better error message when something other than a relation name is given in the FROM clause. It also means we no longer need to do the transform step in ATPostAlterTypeParse(), which saves a bit of code. Author: Jian He <[email protected]> Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com --- src/backend/commands/statscmds.c | 13 +++++++++++-- src/backend/commands/tablecmds.c | 16 +--------------- src/backend/parser/parse_utilcmd.c | 13 +++---------- src/backend/tcop/utility.c | 29 +---------------------------- src/include/commands/defrem.h | 2 +- src/include/parser/parse_utilcmd.h | 2 +- 6 files changed, 18 insertions(+), 57 deletions(-) diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c index 27bf67e7c4b..632228c13ed 100644 --- a/src/backend/commands/statscmds.c +++ b/src/backend/commands/statscmds.c @@ -30,6 +30,7 @@ #include "miscadmin.h" #include "nodes/nodeFuncs.h" #include "optimizer/optimizer.h" +#include "parser/parse_utilcmd.h" #include "statistics/statistics.h" #include "utils/acl.h" #include "utils/builtins.h" @@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b) /* * CREATE STATISTICS + * + * queryString is the source text of the CREATE STATISTICS command, if any. + * + * Normally stmt has not already undergone transformation, but in some cases + * it might have, such as CREATE TABLE (LIKE). */ ObjectAddress -CreateStatistics(CreateStatsStmt *stmt) +CreateStatistics(CreateStatsStmt *stmt, const char *queryString) { int16 attnums[STATS_MAX_DIMENSIONS]; int nattnums = 0; @@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt) if (!IsA(rln, RangeVar)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("only a single relation is allowed in CREATE STATISTICS"))); + errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); /* * CREATE STATISTICS will influence future execution plans but does @@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt) Assert(rel); relid = RelationGetRelid(rel); + /* Run parse analysis */ + stmt = transformStatsStmt(rel, stmt, queryString); + /* * If the node has a name, split it up and determine creation namespace. * If not, put the object in the same namespace as the relation, and cons diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5fd8b51312c..a1732b71e55 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -9650,16 +9650,7 @@ static ObjectAddress ATExecAddStatistics(AlteredTableInfo *tab, Relation rel, CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode) { - ObjectAddress address; - - Assert(IsA(stmt, CreateStatsStmt)); - - /* The CreateStatsStmt has already been through transformStatsStmt */ - Assert(stmt->transformed); - - address = CreateStatistics(stmt); - - return address; + return CreateStatistics(stmt, NULL); } /* @@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd, querytree_list = lappend(querytree_list, stmt); querytree_list = list_concat(querytree_list, afterStmts); } - else if (IsA(stmt, CreateStatsStmt)) - querytree_list = lappend(querytree_list, - transformStatsStmt(oldRelId, - (CreateStatsStmt *) stmt, - cmd)); else querytree_list = lappend(querytree_list, stmt); } diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c index e96b38a59d5..89c8315117b 100644 --- a/src/backend/parser/parse_utilcmd.c +++ b/src/backend/parser/parse_utilcmd.c @@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString) * transformStatsStmt - parse analysis for CREATE STATISTICS * * To avoid race conditions, it's important that this function relies only on - * the passed-in relid (and not on stmt->relation) to determine the target - * relation. + * the passed-in rel (and not on stmt->relation) as the target relation. */ CreateStatsStmt * -transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) +transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString) { ParseState *pstate; ParseNamespaceItem *nsitem; ListCell *l; - Relation rel; /* Nothing to do if statement already transformed. */ if (stmt->transformed) @@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) /* * Put the parent table into the rtable so that the expressions can refer - * to its fields without qualification. Caller is responsible for locking - * relation, but we still need to open it. + * to its fields without qualification. */ - rel = relation_open(relid, NoLock); nsitem = addRangeTableEntryForRelation(pstate, rel, AccessShareLock, NULL, false, true); @@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString) free_parsestate(pstate); - /* Close relation */ - table_close(rel, NoLock); - /* Mark statement as successfully transformed */ stmt->transformed = true; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 918db53dd5e..027356f6e77 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate, break; case T_CreateStatsStmt: - { - Oid relid; - CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree; - RangeVar *rel = (RangeVar *) linitial(stmt->relations); - - if (!IsA(rel, RangeVar)) - ereport(ERROR, - (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), - errmsg("CREATE STATISTICS only supports relation names in the FROM clause"))); - - /* - * CREATE STATISTICS will influence future execution plans - * but does not interfere with currently executing plans. - * So it should be enough to take ShareUpdateExclusiveLock - * on relation, conflicting with ANALYZE and other DDL - * that sets statistical information, but not with normal - * queries. - * - * XXX RangeVarCallbackOwnsRelation not needed here, to - * keep the same behavior as before. - */ - relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false); - - /* Run parse analysis ... */ - stmt = transformStatsStmt(relid, stmt, queryString); - - address = CreateStatistics(stmt); - } + address = CreateStatistics((CreateStatsStmt *) parsetree, queryString); break; case T_AlterStatsStmt: diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h index dd22b5efdfd..684f62109fd 100644 --- a/src/include/commands/defrem.h +++ b/src/include/commands/defrem.h @@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid); extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt); /* commands/statscmds.c */ -extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt); +extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString); extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt); extern void RemoveStatisticsById(Oid statsOid); extern void RemoveStatisticsDataById(Oid statsOid, bool inh); diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h index 4965fac4495..67255799f0a 100644 --- a/src/include/parser/parse_utilcmd.h +++ b/src/include/parser/parse_utilcmd.h @@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt, List **afterStmts); extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString); -extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt, +extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString); extern void transformRuleStmt(RuleStmt *stmt, const char *queryString, List **actions, Node **whereClause); -- 2.47.3 --xzcma6eafn4gmiua-- ^ permalink raw reply [nested|flat] 264+ messages in thread
end of thread, other threads:[~2025-10-17 11:55 UTC | newest] Thread overview: 264+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2024-05-14 23:26 [PATCH v19 6/8] Row pattern recognition patch (docs). Tatsuo Ishii <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]> 2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
This inbox is served by agora; see mirroring instructions for how to clone and mirror all data and code used for this inbox