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* Re: Networking in 7.4?
@ 2003-08-20 18:33 Tom Lane <[email protected]>
2003-08-26 21:10 ` Re: Networking in 7.4? Bruce Momjian <[email protected]>
0 siblings, 1 reply; 265+ messages in thread
From: Tom Lane @ 2003-08-20 18:33 UTC (permalink / raw)
To: Josh Berkus <[email protected]>; +Cc: pgsql-hackers
Josh Berkus <[email protected]> writes:
> Do we have full Rendezvous and IPv6 support in 7.4? That is, sufficient to
> shout about in our PR materials?
The IPv6 support does everything you could want AFAIK, and is certainly
worth a bullet point.
I'm not sure how "full" the Rendezvous support is; we have some
Rendezvous-specific code in the postmaster now, but I have little idea
what it does or whether there is more stuff that Rendezvous users might
wish for. Might be wise to avoid the word "full" in this context.
Unless there is someone on the list who knows Rendezvous well enough
to offer an opinion?
regards, tom lane
^ permalink raw reply [nested|flat] 265+ messages in thread
* Re: Networking in 7.4?
2003-08-20 18:33 Re: Networking in 7.4? Tom Lane <[email protected]>
@ 2003-08-26 21:10 ` Bruce Momjian <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Bruce Momjian @ 2003-08-26 21:10 UTC (permalink / raw)
To: Tom Lane <[email protected]>; +Cc: Josh Berkus <[email protected]>; pgsql-hackers
Tom Lane wrote:
> Josh Berkus <[email protected]> writes:
> > Do we have full Rendezvous and IPv6 support in 7.4? That is, sufficient to
> > shout about in our PR materials?
>
> The IPv6 support does everything you could want AFAIK, and is certainly
> worth a bullet point.
>
> I'm not sure how "full" the Rendezvous support is; we have some
> Rendezvous-specific code in the postmaster now, but I have little idea
> what it does or whether there is more stuff that Rendezvous users might
> wish for. Might be wise to avoid the word "full" in this context.
> Unless there is someone on the list who knows Rendezvous well enough
> to offer an opinion?
The Rendezvous patch submitter doesn't believe there is anything more to
add --- he says it just works.
--
Bruce Momjian | http://candle.pha.pa.us
[email protected] | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
* [PATCH v4] Restructure CreateStatsStmt parse-analysis processing
@ 2025-10-17 11:55 Álvaro Herrera <[email protected]>
0 siblings, 0 replies; 265+ messages in thread
From: Álvaro Herrera @ 2025-10-17 11:55 UTC (permalink / raw)
Previously, a lot of code would be run in the ProcessUtility pipeline,
where it is not welcome (that's supposed to be just a giant dispatcher
switch). Move the parse analysis code to CreateStatistics() instead,
which then means we don't need to open the relation twice; it also
allows us to give a better error message when something other than a
relation name is given in the FROM clause. It also means we no longer
need to do the transform step in ATPostAlterTypeParse(), which saves a
bit of code.
Author: Jian He <[email protected]>
Discussion: https://postgr.es/m/CACJufxFcvo=fM6J9RC88n1U=eS9+5QdftwUNQMu5h7OgjmqDwQ@mail.gmail.com
---
src/backend/commands/statscmds.c | 13 +++++++++++--
src/backend/commands/tablecmds.c | 16 +---------------
src/backend/parser/parse_utilcmd.c | 13 +++----------
src/backend/tcop/utility.c | 29 +----------------------------
src/include/commands/defrem.h | 2 +-
src/include/parser/parse_utilcmd.h | 2 +-
6 files changed, 18 insertions(+), 57 deletions(-)
diff --git a/src/backend/commands/statscmds.c b/src/backend/commands/statscmds.c
index 27bf67e7c4b..632228c13ed 100644
--- a/src/backend/commands/statscmds.c
+++ b/src/backend/commands/statscmds.c
@@ -30,6 +30,7 @@
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
+#include "parser/parse_utilcmd.h"
#include "statistics/statistics.h"
#include "utils/acl.h"
#include "utils/builtins.h"
@@ -58,9 +59,14 @@ compare_int16(const void *a, const void *b)
/*
* CREATE STATISTICS
+ *
+ * queryString is the source text of the CREATE STATISTICS command, if any.
+ *
+ * Normally stmt has not already undergone transformation, but in some cases
+ * it might have, such as CREATE TABLE (LIKE).
*/
ObjectAddress
-CreateStatistics(CreateStatsStmt *stmt)
+CreateStatistics(CreateStatsStmt *stmt, const char *queryString)
{
int16 attnums[STATS_MAX_DIMENSIONS];
int nattnums = 0;
@@ -113,7 +119,7 @@ CreateStatistics(CreateStatsStmt *stmt)
if (!IsA(rln, RangeVar))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only a single relation is allowed in CREATE STATISTICS")));
+ errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
/*
* CREATE STATISTICS will influence future execution plans but does
@@ -151,6 +157,9 @@ CreateStatistics(CreateStatsStmt *stmt)
Assert(rel);
relid = RelationGetRelid(rel);
+ /* Run parse analysis */
+ stmt = transformStatsStmt(rel, stmt, queryString);
+
/*
* If the node has a name, split it up and determine creation namespace.
* If not, put the object in the same namespace as the relation, and cons
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5fd8b51312c..a1732b71e55 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -9650,16 +9650,7 @@ static ObjectAddress
ATExecAddStatistics(AlteredTableInfo *tab, Relation rel,
CreateStatsStmt *stmt, bool is_rebuild, LOCKMODE lockmode)
{
- ObjectAddress address;
-
- Assert(IsA(stmt, CreateStatsStmt));
-
- /* The CreateStatsStmt has already been through transformStatsStmt */
- Assert(stmt->transformed);
-
- address = CreateStatistics(stmt);
-
- return address;
+ return CreateStatistics(stmt, NULL);
}
/*
@@ -15632,11 +15623,6 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
querytree_list = lappend(querytree_list, stmt);
querytree_list = list_concat(querytree_list, afterStmts);
}
- else if (IsA(stmt, CreateStatsStmt))
- querytree_list = lappend(querytree_list,
- transformStatsStmt(oldRelId,
- (CreateStatsStmt *) stmt,
- cmd));
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index e96b38a59d5..89c8315117b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -3137,16 +3137,14 @@ transformIndexStmt(Oid relid, IndexStmt *stmt, const char *queryString)
* transformStatsStmt - parse analysis for CREATE STATISTICS
*
* To avoid race conditions, it's important that this function relies only on
- * the passed-in relid (and not on stmt->relation) to determine the target
- * relation.
+ * the passed-in rel (and not on stmt->relation) as the target relation.
*/
CreateStatsStmt *
-transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
+transformStatsStmt(Relation rel, CreateStatsStmt *stmt, const char *queryString)
{
ParseState *pstate;
ParseNamespaceItem *nsitem;
ListCell *l;
- Relation rel;
/* Nothing to do if statement already transformed. */
if (stmt->transformed)
@@ -3158,10 +3156,8 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
/*
* Put the parent table into the rtable so that the expressions can refer
- * to its fields without qualification. Caller is responsible for locking
- * relation, but we still need to open it.
+ * to its fields without qualification.
*/
- rel = relation_open(relid, NoLock);
nsitem = addRangeTableEntryForRelation(pstate, rel,
AccessShareLock,
NULL, false, true);
@@ -3196,9 +3192,6 @@ transformStatsStmt(Oid relid, CreateStatsStmt *stmt, const char *queryString)
free_parsestate(pstate);
- /* Close relation */
- table_close(rel, NoLock);
-
/* Mark statement as successfully transformed */
stmt->transformed = true;
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index 918db53dd5e..027356f6e77 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1866,34 +1866,7 @@ ProcessUtilitySlow(ParseState *pstate,
break;
case T_CreateStatsStmt:
- {
- Oid relid;
- CreateStatsStmt *stmt = (CreateStatsStmt *) parsetree;
- RangeVar *rel = (RangeVar *) linitial(stmt->relations);
-
- if (!IsA(rel, RangeVar))
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("CREATE STATISTICS only supports relation names in the FROM clause")));
-
- /*
- * CREATE STATISTICS will influence future execution plans
- * but does not interfere with currently executing plans.
- * So it should be enough to take ShareUpdateExclusiveLock
- * on relation, conflicting with ANALYZE and other DDL
- * that sets statistical information, but not with normal
- * queries.
- *
- * XXX RangeVarCallbackOwnsRelation not needed here, to
- * keep the same behavior as before.
- */
- relid = RangeVarGetRelid(rel, ShareUpdateExclusiveLock, false);
-
- /* Run parse analysis ... */
- stmt = transformStatsStmt(relid, stmt, queryString);
-
- address = CreateStatistics(stmt);
- }
+ address = CreateStatistics((CreateStatsStmt *) parsetree, queryString);
break;
case T_AlterStatsStmt:
diff --git a/src/include/commands/defrem.h b/src/include/commands/defrem.h
index dd22b5efdfd..684f62109fd 100644
--- a/src/include/commands/defrem.h
+++ b/src/include/commands/defrem.h
@@ -85,7 +85,7 @@ extern void RemoveOperatorById(Oid operOid);
extern ObjectAddress AlterOperator(AlterOperatorStmt *stmt);
/* commands/statscmds.c */
-extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt);
+extern ObjectAddress CreateStatistics(CreateStatsStmt *stmt, const char *queryString);
extern ObjectAddress AlterStatistics(AlterStatsStmt *stmt);
extern void RemoveStatisticsById(Oid statsOid);
extern void RemoveStatisticsDataById(Oid statsOid, bool inh);
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 4965fac4495..67255799f0a 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -26,7 +26,7 @@ extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
-extern CreateStatsStmt *transformStatsStmt(Oid relid, CreateStatsStmt *stmt,
+extern CreateStatsStmt *transformStatsStmt(Relation rel, CreateStatsStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
List **actions, Node **whereClause);
--
2.47.3
--xzcma6eafn4gmiua--
^ permalink raw reply [nested|flat] 265+ messages in thread
end of thread, other threads:[~2025-10-17 11:55 UTC | newest]
Thread overview: 265+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2003-08-20 18:33 Re: Networking in 7.4? Tom Lane <[email protected]>
2003-08-26 21:10 ` Bruce Momjian <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
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2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
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2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
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2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
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2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
2025-10-17 11:55 [PATCH v4] Restructure CreateStatsStmt parse-analysis processing Álvaro Herrera <[email protected]>
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