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* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v32 1/6] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--ques2rolqe435p6o
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v32-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v30 1/6] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 4 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 334 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 20dc8c605b..728f781620 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2597,6 +2597,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 9d9e915979..db746c99b6 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1058,7 +1058,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1339,7 +1340,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 56e0bcf39e..22e8a46695 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(typoid,
(Form_pg_type) GETSTRUCT(tup),
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(Oid typeObjectId,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 99528bf1d5..660e6df39a 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -95,6 +95,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -126,6 +127,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -144,6 +146,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -166,6 +169,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid resulttype;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -265,6 +269,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -335,6 +341,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -516,6 +524,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -635,7 +647,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -676,7 +689,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -739,6 +753,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -866,6 +881,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1071,7 +1089,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1111,7 +1130,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1226,7 +1246,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1266,7 +1287,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1554,7 +1576,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == address.objectId);
/* Create the entry in pg_range */
@@ -1596,7 +1619,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1940,6 +1964,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting function parse always take two INTERNAL argument and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting functions fetch/assign always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 91aa386fa6..a756f4ba8d 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2543,18 +2543,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2578,19 +2576,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index eafd484900..a945cad9d3 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3134,8 +3134,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3155,7 +3155,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3169,36 +3169,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3211,40 +3189,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3258,59 +3216,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index e04c33e4ad..d3a15dc0a5 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1509,8 +1509,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index 5b1ba143b1..e1d23e54d5 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e084c3f069..5bc53474c6 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1173,8 +1173,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index d5b23a3479..f537a30772 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -668,8 +668,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 831db4af95..3173277e44 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..12dde390d3 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coersion) is placen in
+ * separate procedure indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container, if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in case if current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..a5e734837f 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting it's custom code who should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscriptinng information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 5e63238f03..7d56a998ab 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7980,17 +7980,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index 3da90cb72a..78a6006fac 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3176,6 +3176,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index 831c89f473..31ef7c8076 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -538,6 +538,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index f972f941e0..7e2b8d6dc7 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is none, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -338,7 +344,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(Oid typeObjectId,
Form_pg_type typeForm,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index 8bbf6621da..846b834f2d 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -650,13 +650,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -669,6 +669,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..2aa64e788f 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,7 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +323,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines* getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index f132d39458..ff8f187b38 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -180,6 +180,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
#define type_is_array(typid) (get_element_type(typid) != InvalidOid)
--
2.21.0
--g5st7yssq7xavhfb
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v30-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v35 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 7 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 26 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 15 +-
src/include/nodes/primnodes.h | 8 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 333 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 1eac9edaee..31ba120fb2 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2800,6 +2800,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 67144aa3c9..4d552589ae 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1091,7 +1091,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1370,7 +1371,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 0b04dff773..7744bca30a 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 483bb65ddc..33d4fb401d 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -149,6 +150,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -167,6 +169,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -188,6 +191,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -288,6 +292,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -358,6 +364,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -482,6 +490,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -563,7 +575,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -604,7 +617,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -667,6 +681,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -800,6 +815,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1005,7 +1023,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1045,7 +1064,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1160,7 +1180,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1200,7 +1221,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1488,7 +1510,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1531,7 +1554,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1904,6 +1928,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..a18fe5f9d0 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,17 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+ sbsrefstate->refopaque = sbsref->refopaque;
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2579,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 0409a40b82..b376a200c8 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e2d1b987bf..fe87f09ea2 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index d24420c583..642ab27538 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 15877e37a6..75f86d8d5b 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index 2c61ca8aa8..d3bdefccf0 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..06361e8da8 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -654,17 +654,19 @@ typedef struct SubscriptingRefState
int16 refelemlength; /* typlen of the container element type */
bool refelembyval; /* is the element type pass-by-value? */
char refelemalign; /* typalign of the element type */
+ void *refopaque; /* opaque data structure for implementation
+ specific information */
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +679,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..0cd7763683 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,20 +417,28 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
Expr *refassgnexpr; /* expression for the source value, or NULL if
* fetch */
+ void *refopaque; /* opaque data structure for implementation
+ specific information */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--evj76j7ekwacmcsz
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v35-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v31 1/6] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index cef8bb5a49..5463e13925 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index e393c93a45..ba284f5608 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1060,7 +1060,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1341,7 +1342,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index cd56714968..9eb43ec3d6 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -720,6 +723,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 8891b1d564..3a742b3c24 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting function parse always take two INTERNAL argument and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting functions fetch/assign always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 491452ae2d..cef4e66911 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index 8408c28ec6..cbf4228a38 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index bb1565467d..50f1cc54b3 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index eb01584a5f..8dc3a96377 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 831db4af95..3173277e44 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..12dde390d3 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coersion) is placen in
+ * separate procedure indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container, if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in case if current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..a5e734837f 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting it's custom code who should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscriptinng information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 723a8fa48c..9be3f5755a 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -8004,17 +8004,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index 63d1263502..f55a57501b 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3237,6 +3237,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index d72b23afe4..70a3bee0a3 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -538,6 +538,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..5dbdc880dc 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is none, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..f0786ac570 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines* getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index 91aed1f5a5..e6fb211a8a 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -182,6 +182,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--bvn7grlx53cj2mie
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v31-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v29 1/6] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_class.dat | 2 +-
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 4 +-
src/include/utils/lsyscache.h | 1 +
23 files changed, 335 insertions(+), 327 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 63b5888ebb..64bbd285ee 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2606,6 +2606,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 8404904710..ec512c3400 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1026,7 +1026,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1307,7 +1308,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index a8c1de511f..00abea897e 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(typoid,
(Form_pg_type) GETSTRUCT(tup),
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -371,6 +373,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -694,6 +697,14 @@ GenerateTypeDependencies(Oid typeObjectId,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 89887b8fd7..a9ffefc845 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -95,6 +95,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -126,6 +127,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -144,6 +146,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -166,6 +169,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid resulttype;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -265,6 +269,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -335,6 +341,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -516,6 +524,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -635,7 +647,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -676,7 +689,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -739,6 +753,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -866,6 +881,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1071,7 +1089,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1111,7 +1130,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1226,7 +1246,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1266,7 +1287,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1554,7 +1576,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == address.objectId);
/* Create the entry in pg_range */
@@ -1596,7 +1619,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1940,6 +1964,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting function parse always take two INTERNAL argument and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting functions fetch/assign always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 8da2e2dcbb..37aad3c625 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2544,18 +2544,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2579,19 +2577,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index dbed597816..ecc1b5e736 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3159,8 +3159,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3180,7 +3180,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3194,36 +3194,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3236,40 +3214,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3283,59 +3241,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index a9b8b84b8f..30cb898487 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1508,8 +1508,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index 2fcd4a3467..52a41130d4 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -270,8 +270,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index ac02e5ec8d..13a1f7847b 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1172,8 +1172,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 3f9ebc9044..1e214c391b 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -668,8 +668,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index eb91da2d87..0d98c750b6 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -432,11 +432,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -464,13 +466,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -487,13 +496,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index bc832e79dc..9f5a6226e3 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -205,21 +205,12 @@ make_var(ParseState *pstate, RangeTblEntry *rte, int attrno, int location)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -240,25 +231,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -275,10 +247,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coersion) is placen in
+ * separate procedure indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container, if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in case if current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -305,16 +282,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -348,29 +321,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -378,63 +328,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -443,17 +353,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 30d419e087..3bc91c6a36 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -689,7 +689,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -852,27 +852,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting it's custom code who should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -904,29 +898,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -936,25 +943,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscriptinng information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 4af1603e7c..bdd665cff0 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -8056,17 +8056,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index 27602fa49c..2610c8dd02 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3150,6 +3150,29 @@ get_range_subtype(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index 00e41ac546..79df44c0bc 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -539,6 +539,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_class.dat b/src/include/catalog/pg_class.dat
index 9bcf28676d..fe0aa5799a 100644
--- a/src/include/catalog/pg_class.dat
+++ b/src/include/catalog/pg_class.dat
@@ -24,7 +24,7 @@
relname => 'pg_type', reltype => 'pg_type', relam => 'heap',
relfilenode => '0', relpages => '0', reltuples => '0', relallvisible => '0',
reltoastrelid => '0', relhasindex => 'f', relisshared => 'f',
- relpersistence => 'p', relkind => 'r', relnatts => '31', relchecks => '0',
+ relpersistence => 'p', relkind => 'r', relnatts => '32', relchecks => '0',
relhasrules => 'f', relhastriggers => 'f', relhassubclass => 'f',
relrowsecurity => 'f', relforcerowsecurity => 'f', relispopulated => 't',
relreplident => 'n', relispartition => 'f', relfrozenxid => '3',
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 0c273a0449..3d708bd0d9 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -216,6 +216,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is none, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -323,7 +329,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(Oid typeObjectId,
Form_pg_type typeForm,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index d21dbead0a..f9cf0af117 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -672,13 +672,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -691,6 +691,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index 860a84de7c..e7db3b2705 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -403,13 +403,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -417,6 +421,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index 7c099e7084..28f7d27c82 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -274,7 +275,7 @@ extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
int location);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -283,6 +284,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines* getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index c8df5bff9f..d7f250a154 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -179,6 +179,7 @@ extern void free_attstatsslot(AttStatsSlot *sslot);
extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
#define type_is_array(typid) (get_element_type(typid) != InvalidOid)
--
2.21.0
--adquyx6kg5n26q6j
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v29-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v34 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 7 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 328 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 1eac9edaee..31ba120fb2 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2800,6 +2800,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 67144aa3c9..4d552589ae 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1091,7 +1091,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1370,7 +1371,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 0b04dff773..7744bca30a 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 483bb65ddc..33d4fb401d 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -149,6 +150,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -167,6 +169,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -188,6 +191,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -288,6 +292,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -358,6 +364,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -482,6 +490,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -563,7 +575,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -604,7 +617,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -667,6 +681,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -800,6 +815,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1005,7 +1023,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1045,7 +1064,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1160,7 +1180,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1200,7 +1221,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1488,7 +1510,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1531,7 +1554,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1904,6 +1928,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 0409a40b82..b376a200c8 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e2d1b987bf..fe87f09ea2 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index d24420c583..642ab27538 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 15877e37a6..75f86d8d5b 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index 2c61ca8aa8..d3bdefccf0 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--j77abfbqdsj2lq6d
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v34-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v32 1/6] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--xuxpg5p32zizz4zy
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v32-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* [PATCH v33 1/5] Base implementation of subscripting mechanism
@ 2019-01-31 21:37 erthalion <[email protected]>
0 siblings, 0 replies; 31+ messages in thread
From: erthalion @ 2019-01-31 21:37 UTC (permalink / raw)
Introduce all the required machinery for generalizing subscripting
operation for a different data types:
* subscripting handler procedure, to set up a relation between data type
and corresponding subscripting logic.
* subscripting routines, that help generalize a subscripting logic,
since it involves few stages, namely preparation (e.g. to figure out
required types), validation (to check the input and return meaningful
error message), fetch (executed when we extract a value using
subscripting), assign (executed when we update a data type with a new
value using subscripting). Without this it would be neccessary to
introduce more new fields to pg_type, which would be too invasive.
All ArrayRef related logic was removed and landed as a separate
subscripting implementation in the following patch from this series. The
rest of the code was rearranged, to e.g. store a type of assigned value
for an assign operation.
Reviewed-by: Tom Lane, Arthur Zakirov
---
.../pg_stat_statements/pg_stat_statements.c | 1 +
src/backend/catalog/heap.c | 6 +-
src/backend/catalog/pg_type.c | 15 +-
src/backend/commands/typecmds.c | 77 +++++++++-
src/backend/executor/execExpr.c | 25 +---
src/backend/executor/execExprInterp.c | 124 +++------------
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/equalfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 2 +
src/backend/nodes/readfuncs.c | 2 +
src/backend/parser/parse_expr.c | 54 ++++---
src/backend/parser/parse_node.c | 141 ++++--------------
src/backend/parser/parse_target.c | 88 +++++------
src/backend/utils/adt/ruleutils.c | 21 +--
src/backend/utils/cache/lsyscache.c | 23 +++
src/include/c.h | 2 +
src/include/catalog/pg_type.h | 9 +-
src/include/executor/execExpr.h | 13 +-
src/include/nodes/primnodes.h | 6 +
src/include/nodes/subscripting.h | 42 ++++++
src/include/parser/parse_node.h | 6 +-
src/include/utils/lsyscache.h | 1 +
22 files changed, 336 insertions(+), 326 deletions(-)
create mode 100644 src/include/nodes/subscripting.h
diff --git a/contrib/pg_stat_statements/pg_stat_statements.c b/contrib/pg_stat_statements/pg_stat_statements.c
index 14cad19afb..bf19507d32 100644
--- a/contrib/pg_stat_statements/pg_stat_statements.c
+++ b/contrib/pg_stat_statements/pg_stat_statements.c
@@ -2793,6 +2793,7 @@ JumbleExpr(pgssJumbleState *jstate, Node *node)
JumbleExpr(jstate, (Node *) sbsref->reflowerindexpr);
JumbleExpr(jstate, (Node *) sbsref->refexpr);
JumbleExpr(jstate, (Node *) sbsref->refassgnexpr);
+ APP_JUMB(sbsref->refnestedfunc);
}
break;
case T_FuncExpr:
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 3985326df6..911e2a1ffe 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -1056,7 +1056,8 @@ AddNewRelationType(const char *typeName,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ InvalidOid); /* typsubshandler - none */
}
/* --------------------------------
@@ -1335,7 +1336,8 @@ heap_create_with_catalog(const char *relname,
-1, /* typmod */
0, /* array dimensions for typBaseType */
false, /* Type NOT NULL */
- InvalidOid); /* rowtypes never have a collation */
+ InvalidOid, /* rowtypes never have a collation */
+ 0); /* array implementation */
pfree(relarrayname);
}
diff --git a/src/backend/catalog/pg_type.c b/src/backend/catalog/pg_type.c
index 79ffe317dd..bf353878f5 100644
--- a/src/backend/catalog/pg_type.c
+++ b/src/backend/catalog/pg_type.c
@@ -118,6 +118,7 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(-1);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(0);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(InvalidOid);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(InvalidOid);
nulls[Anum_pg_type_typdefaultbin - 1] = true;
nulls[Anum_pg_type_typdefault - 1] = true;
nulls[Anum_pg_type_typacl - 1] = true;
@@ -158,10 +159,10 @@ TypeShellMake(const char *typeName, Oid typeNamespace, Oid ownerId)
GenerateTypeDependencies(tup,
pg_type_desc,
NULL,
- NULL,
0,
false,
false,
+ InvalidOid,
false);
/* Post creation hook for new shell type */
@@ -219,7 +220,8 @@ TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims, /* Array dimensions for baseType */
bool typeNotNull,
- Oid typeCollation)
+ Oid typeCollation,
+ Oid subscriptingHandlerProcedure)
{
Relation pg_type_desc;
Oid typeObjectId;
@@ -372,6 +374,7 @@ TypeCreate(Oid newTypeOid,
values[Anum_pg_type_typtypmod - 1] = Int32GetDatum(typeMod);
values[Anum_pg_type_typndims - 1] = Int32GetDatum(typNDims);
values[Anum_pg_type_typcollation - 1] = ObjectIdGetDatum(typeCollation);
+ values[Anum_pg_type_typsubshandler - 1] = ObjectIdGetDatum(subscriptingHandlerProcedure);
/*
* initialize the default binary value for this type. Check for nulls of
@@ -695,6 +698,14 @@ GenerateTypeDependencies(HeapTuple typeTuple,
/* Normal dependency on the default expression. */
if (defaultExpr)
recordDependencyOnExpr(&myself, defaultExpr, NIL, DEPENDENCY_NORMAL);
+
+ if (OidIsValid(typeForm->typsubshandler))
+ {
+ referenced.classId = ProcedureRelationId;
+ referenced.objectId = typeForm->typsubshandler;
+ referenced.objectSubId = 0;
+ recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
+ }
}
/*
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 9e5938b10e..bf1e6fdc5c 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -115,6 +115,7 @@ static Oid findTypeSendFunction(List *procname, Oid typeOid);
static Oid findTypeTypmodinFunction(List *procname);
static Oid findTypeTypmodoutFunction(List *procname);
static Oid findTypeAnalyzeFunction(List *procname, Oid typeOid);
+static Oid findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc);
static Oid findRangeSubOpclass(List *opcname, Oid subtype);
static Oid findRangeCanonicalFunction(List *procname, Oid typeOid);
static Oid findRangeSubtypeDiffFunction(List *procname, Oid subtype);
@@ -148,6 +149,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
List *typmodinName = NIL;
List *typmodoutName = NIL;
List *analyzeName = NIL;
+ List *subscriptingParseName = NIL;
char category = TYPCATEGORY_USER;
bool preferred = false;
char delimiter = DEFAULT_TYPDELIM;
@@ -166,6 +168,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
DefElem *typmodinNameEl = NULL;
DefElem *typmodoutNameEl = NULL;
DefElem *analyzeNameEl = NULL;
+ DefElem *subscriptingParseNameEl = NULL;
DefElem *categoryEl = NULL;
DefElem *preferredEl = NULL;
DefElem *delimiterEl = NULL;
@@ -187,6 +190,7 @@ DefineType(ParseState *pstate, List *names, List *parameters)
Oid typoid;
ListCell *pl;
ObjectAddress address;
+ Oid subscriptingParseOid = InvalidOid;
/*
* As of Postgres 8.4, we require superuser privilege to create a base
@@ -287,6 +291,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
else if (strcmp(defel->defname, "analyze") == 0 ||
strcmp(defel->defname, "analyse") == 0)
defelp = &analyzeNameEl;
+ else if (strcmp(defel->defname, "subscripting_handler") == 0)
+ defelp = &subscriptingParseNameEl;
else if (strcmp(defel->defname, "category") == 0)
defelp = &categoryEl;
else if (strcmp(defel->defname, "preferred") == 0)
@@ -357,6 +363,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
typmodoutName = defGetQualifiedName(typmodoutNameEl);
if (analyzeNameEl)
analyzeName = defGetQualifiedName(analyzeNameEl);
+ if (subscriptingParseNameEl)
+ subscriptingParseName = defGetQualifiedName(subscriptingParseNameEl);
if (categoryEl)
{
char *p = defGetString(categoryEl);
@@ -481,6 +489,10 @@ DefineType(ParseState *pstate, List *names, List *parameters)
if (analyzeName)
analyzeOid = findTypeAnalyzeFunction(analyzeName, typoid);
+ if (subscriptingParseName)
+ subscriptingParseOid = findTypeSubscriptingFunction(subscriptingParseName,
+ typoid, true);
+
/*
* Check permissions on functions. We choose to require the creator/owner
* of a type to also own the underlying functions. Since creating a type
@@ -562,7 +574,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array Dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ subscriptingParseOid); /* subscripting procedure */
Assert(typoid == address.objectId);
/*
@@ -603,7 +616,8 @@ DefineType(ParseState *pstate, List *names, List *parameters)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- collation); /* type's collation */
+ collation, /* type's collation */
+ 0);
pfree(array_type);
@@ -666,6 +680,7 @@ DefineDomain(CreateDomainStmt *stmt)
Oid receiveProcedure;
Oid sendProcedure;
Oid analyzeProcedure;
+ Oid subscriptingHandlerProcedure;
bool byValue;
char category;
char delimiter;
@@ -799,6 +814,9 @@ DefineDomain(CreateDomainStmt *stmt)
/* Analysis function */
analyzeProcedure = baseType->typanalyze;
+ /* Subscripting functions */
+ subscriptingHandlerProcedure = baseType->typsubshandler;
+
/* Inherited default value */
datum = SysCacheGetAttr(TYPEOID, typeTup,
Anum_pg_type_typdefault, &isnull);
@@ -1004,7 +1022,8 @@ DefineDomain(CreateDomainStmt *stmt)
basetypeMod, /* typeMod value */
typNDims, /* Array dimensions for base type */
typNotNull, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ subscriptingHandlerProcedure); /* subscripting procedure */
/*
* Create the array type that goes with it.
@@ -1044,7 +1063,8 @@ DefineDomain(CreateDomainStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- domaincoll); /* type's collation */
+ domaincoll, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(domainArrayName);
@@ -1159,7 +1179,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ InvalidOid); /* typsubshandler - none */
/* Enter the enum's values into pg_enum */
EnumValuesCreate(enumTypeAddr.objectId, stmt->vals);
@@ -1199,7 +1220,8 @@ DefineEnum(CreateEnumStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation */
+ InvalidOid, /* type's collation */
+ 0); /* array subscripting implementation */
pfree(enumArrayName);
@@ -1487,7 +1509,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* type's collation (ranges never have one) */
+ InvalidOid, /* type's collation (ranges never have one) */
+ InvalidOid); /* typsubshandler - none */
Assert(typoid == InvalidOid || typoid == address.objectId);
typoid = address.objectId;
@@ -1530,7 +1553,8 @@ DefineRange(CreateRangeStmt *stmt)
-1, /* typMod (Domains only) */
0, /* Array dimensions of typbasetype */
false, /* Type NOT NULL */
- InvalidOid); /* typcollation */
+ InvalidOid, /* typcollation */
+ 0); /* array subscripting implementation */
pfree(rangeArrayName);
@@ -1881,6 +1905,43 @@ findTypeAnalyzeFunction(List *procname, Oid typeOid)
return procOid;
}
+static Oid
+findTypeSubscriptingFunction(List *procname, Oid typeOid, bool parseFunc)
+{
+ Oid argList[2];
+ Oid procOid;
+ int nargs;
+
+ if (parseFunc)
+ {
+ /*
+ * Subscripting parse functions always take two INTERNAL arguments and
+ * return INTERNAL.
+ */
+ argList[0] = INTERNALOID;
+ nargs = 1;
+ }
+ else
+ {
+ /*
+ * Subscripting fetch/assign functions always take one typeOid
+ * argument, one INTERNAL argument and return typeOid.
+ */
+ argList[0] = typeOid;
+ argList[1] = INTERNALOID;
+ nargs = 2;
+ }
+
+ procOid = LookupFuncName(procname, nargs, argList, true);
+ if (!OidIsValid(procOid))
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_FUNCTION),
+ errmsg("function %s does not exist",
+ func_signature_string(procname, nargs, NIL, argList))));
+
+ return procOid;
+}
+
/*
* Find suitable support functions and opclasses for a range type.
*/
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 236413f62a..ee1077ebe9 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -2545,18 +2545,16 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
{
bool isAssignment = (sbsref->refassgnexpr != NULL);
SubscriptingRefState *sbsrefstate = palloc0(sizeof(SubscriptingRefState));
- List *adjust_jumps = NIL;
- ListCell *lc;
- int i;
+ List *adjust_jumps = NIL;
+ ListCell *lc;
+ int i;
+ RegProcedure typsubshandler = get_typsubsprocs(sbsref->refcontainertype);
/* Fill constant fields of SubscriptingRefState */
sbsrefstate->isassignment = isAssignment;
sbsrefstate->refelemtype = sbsref->refelemtype;
sbsrefstate->refattrlength = get_typlen(sbsref->refcontainertype);
- get_typlenbyvalalign(sbsref->refelemtype,
- &sbsrefstate->refelemlength,
- &sbsrefstate->refelembyval,
- &sbsrefstate->refelemalign);
+ sbsrefstate->sbsroutines = (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
/*
* Evaluate array input. It's safe to do so into resv/resnull, because we
@@ -2580,19 +2578,6 @@ ExecInitSubscriptingRef(ExprEvalStep *scratch, SubscriptingRef *sbsref,
state->steps_len - 1);
}
- /* Verify subscript list lengths are within limit */
- if (list_length(sbsref->refupperindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->refupperindexpr), MAXDIM)));
-
- if (list_length(sbsref->reflowerindexpr) > MAXDIM)
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
- list_length(sbsref->reflowerindexpr), MAXDIM)));
-
/* Evaluate upper subscripts */
i = 0;
foreach(lc, sbsref->refupperindexpr)
diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c
index b812bbacee..838bb4d005 100644
--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3146,8 +3146,8 @@ bool
ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
- int *indexes;
- int off;
+ Datum *indexes;
+ int off;
/* If any index expr yields NULL, result is NULL or error */
if (sbsrefstate->subscriptnull)
@@ -3167,7 +3167,7 @@ ExecEvalSubscriptingRef(ExprState *state, ExprEvalStep *op)
indexes = sbsrefstate->lowerindex;
off = op->d.sbsref_subscript.off;
- indexes[off] = DatumGetInt32(sbsrefstate->subscriptvalue);
+ indexes[off] = sbsrefstate->subscriptvalue;
return true;
}
@@ -3181,36 +3181,14 @@ void
ExecEvalSubscriptingRefFetch(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
/* Should not get here if source container (or any subscript) is null */
Assert(!(*op->resnull));
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- op->resnull);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+
+ *op->resvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
@@ -3223,40 +3201,20 @@ void
ExecEvalSubscriptingRefOld(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
if (*op->resnull)
{
- /* whole array is null, so any element or slice is too */
+ /* whole container is null, so any element or slice is too */
sbsrefstate->prevvalue = (Datum) 0;
sbsrefstate->prevnull = true;
}
- else if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- sbsrefstate->prevvalue = array_get_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign,
- &sbsrefstate->prevnull);
- }
else
{
- /* Slice case */
- /* this is currently unreachable */
- sbsrefstate->prevvalue = array_get_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- sbsrefstate->prevnull = false;
+ sbsrefstate->prevvalue = sbsroutines->fetch(*op->resvalue, sbsrefstate);
+
+ if (sbsrefstate->numlower != 0)
+ sbsrefstate->prevnull = false;
}
}
@@ -3270,59 +3228,11 @@ void
ExecEvalSubscriptingRefAssign(ExprState *state, ExprEvalStep *op)
{
SubscriptingRefState *sbsrefstate = op->d.sbsref_subscript.state;
+ SubscriptRoutines *sbsroutines = sbsrefstate->sbsroutines;
- /*
- * For an assignment to a fixed-length container type, both the original
- * container and the value to be assigned into it must be non-NULL, else
- * we punt and return the original container.
- */
- if (sbsrefstate->refattrlength > 0)
- {
- if (*op->resnull || sbsrefstate->replacenull)
- return;
- }
-
- /*
- * For assignment to varlena arrays, we handle a NULL original array by
- * substituting an empty (zero-dimensional) array; insertion of the new
- * element will result in a singleton array value. It does not matter
- * whether the new element is NULL.
- */
- if (*op->resnull)
- {
- *op->resvalue = PointerGetDatum(construct_empty_array(sbsrefstate->refelemtype));
- *op->resnull = false;
- }
-
- if (sbsrefstate->numlower == 0)
- {
- /* Scalar case */
- *op->resvalue = array_set_element(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
- else
- {
- /* Slice case */
- *op->resvalue = array_set_slice(*op->resvalue,
- sbsrefstate->numupper,
- sbsrefstate->upperindex,
- sbsrefstate->lowerindex,
- sbsrefstate->upperprovided,
- sbsrefstate->lowerprovided,
- sbsrefstate->replacevalue,
- sbsrefstate->replacenull,
- sbsrefstate->refattrlength,
- sbsrefstate->refelemlength,
- sbsrefstate->refelembyval,
- sbsrefstate->refelemalign);
- }
+ sbsrefstate->resnull = *op->resnull;
+ *op->resvalue = sbsroutines->assign(*op->resvalue, sbsrefstate);
+ *op->resnull = sbsrefstate->resnull;
}
/*
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 89c409de66..ec9b0dd97f 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -1548,8 +1548,10 @@ _copySubscriptingRef(const SubscriptingRef *from)
COPY_SCALAR_FIELD(refcontainertype);
COPY_SCALAR_FIELD(refelemtype);
+ COPY_SCALAR_FIELD(refassgntype);
COPY_SCALAR_FIELD(reftypmod);
COPY_SCALAR_FIELD(refcollid);
+ COPY_SCALAR_FIELD(refnestedfunc);
COPY_NODE_FIELD(refupperindexpr);
COPY_NODE_FIELD(reflowerindexpr);
COPY_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index e3f33c40be..48b436f7f7 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -274,8 +274,10 @@ _equalSubscriptingRef(const SubscriptingRef *a, const SubscriptingRef *b)
{
COMPARE_SCALAR_FIELD(refcontainertype);
COMPARE_SCALAR_FIELD(refelemtype);
+ COMPARE_SCALAR_FIELD(refassgntype);
COMPARE_SCALAR_FIELD(reftypmod);
COMPARE_SCALAR_FIELD(refcollid);
+ COMPARE_SCALAR_FIELD(refnestedfunc);
COMPARE_NODE_FIELD(refupperindexpr);
COMPARE_NODE_FIELD(reflowerindexpr);
COMPARE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index e2f177515d..70c9736c46 100644
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1194,8 +1194,10 @@ _outSubscriptingRef(StringInfo str, const SubscriptingRef *node)
WRITE_OID_FIELD(refcontainertype);
WRITE_OID_FIELD(refelemtype);
+ WRITE_OID_FIELD(refassgntype);
WRITE_INT_FIELD(reftypmod);
WRITE_OID_FIELD(refcollid);
+ WRITE_OID_FIELD(refnestedfunc);
WRITE_NODE_FIELD(refupperindexpr);
WRITE_NODE_FIELD(reflowerindexpr);
WRITE_NODE_FIELD(refexpr);
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c
index 42050ab719..1c9752c771 100644
--- a/src/backend/nodes/readfuncs.c
+++ b/src/backend/nodes/readfuncs.c
@@ -669,8 +669,10 @@ _readSubscriptingRef(void)
READ_OID_FIELD(refcontainertype);
READ_OID_FIELD(refelemtype);
+ READ_OID_FIELD(refassgntype);
READ_INT_FIELD(reftypmod);
READ_OID_FIELD(refcollid);
+ READ_OID_FIELD(refnestedfunc);
READ_NODE_FIELD(refupperindexpr);
READ_NODE_FIELD(reflowerindexpr);
READ_NODE_FIELD(refexpr);
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index f69976cc8c..ea9d35429c 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -433,11 +433,13 @@ unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)
{
- Node *last_srf = pstate->p_last_srf;
- Node *result = transformExprRecurse(pstate, ind->arg);
- List *subscripts = NIL;
- int location = exprLocation(result);
- ListCell *i;
+ Node *last_srf = pstate->p_last_srf;
+ Node *result = transformExprRecurse(pstate, ind->arg);
+ SubscriptRoutines *sbsroutines;
+ SubscriptingRef *sbsref;
+ List *subscripts = NIL;
+ int location = exprLocation(result);
+ ListCell *i;
/*
* We have to split any field-selection operations apart from
@@ -465,13 +467,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
/* process subscripts before this field selection */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
subscripts = NIL;
newresult = ParseFuncOrColumn(pstate,
@@ -488,13 +497,20 @@ transformIndirection(ParseState *pstate, A_Indirection *ind)
}
/* process trailing subscripts, if any */
if (subscripts)
- result = (Node *) transformContainerSubscripts(pstate,
- result,
- exprType(result),
- InvalidOid,
- exprTypmod(result),
- subscripts,
- NULL);
+ {
+ sbsref = transformContainerSubscripts(pstate,
+ result,
+ exprType(result),
+ InvalidOid,
+ exprTypmod(result),
+ subscripts,
+ NULL);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+ sbsref = sbsroutines->prepare(false, sbsref);
+ sbsroutines->validate(false, sbsref, pstate);
+ result = (Node *) sbsref;
+ }
return result;
}
diff --git a/src/backend/parser/parse_node.c b/src/backend/parser/parse_node.c
index 6e98fe55fc..4f46d6310a 100644
--- a/src/backend/parser/parse_node.c
+++ b/src/backend/parser/parse_node.c
@@ -184,21 +184,12 @@ pcb_error_callback(void *arg)
* transformContainerType()
* Identify the types involved in a subscripting operation for container
*
- *
- * On entry, containerType/containerTypmod identify the type of the input value
- * to be subscripted (which could be a domain type). These are modified if
- * necessary to identify the actual container type and typmod, and the
- * container's element type is returned. An error is thrown if the input isn't
- * an array type.
+ * On entry, containerType/containerTypmod are modified if necessary to
+ * identify the actual container type and typmod.
*/
-Oid
+void
transformContainerType(Oid *containerType, int32 *containerTypmod)
{
- Oid origContainerType = *containerType;
- Oid elementType;
- HeapTuple type_tuple_container;
- Form_pg_type type_struct_container;
-
/*
* If the input is a domain, smash to base type, and extract the actual
* typmod to be applied to the base type. Subscripting a domain is an
@@ -219,25 +210,6 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
*containerType = INT2ARRAYOID;
else if (*containerType == OIDVECTOROID)
*containerType = OIDARRAYOID;
-
- /* Get the type tuple for the container */
- type_tuple_container = SearchSysCache1(TYPEOID, ObjectIdGetDatum(*containerType));
- if (!HeapTupleIsValid(type_tuple_container))
- elog(ERROR, "cache lookup failed for type %u", *containerType);
- type_struct_container = (Form_pg_type) GETSTRUCT(type_tuple_container);
-
- /* needn't check typisdefined since this will fail anyway */
-
- elementType = type_struct_container->typelem;
- if (elementType == InvalidOid)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("cannot subscript type %s because it is not an array",
- format_type_be(origContainerType))));
-
- ReleaseSysCache(type_tuple_container);
-
- return elementType;
}
/*
@@ -254,10 +226,15 @@ transformContainerType(Oid *containerType, int32 *containerTypmod)
* container. We produce an expression that represents the new container value
* with the source data inserted into the right part of the container.
*
- * For both cases, if the source container is of a domain-over-array type,
- * the result is of the base array type or its element type; essentially,
- * we must fold a domain to its base type before applying subscripting.
- * (Note that int2vector and oidvector are treated as domains here.)
+ * For both cases, this function contains only general subscripting logic while
+ * type-specific logic (e.g. type verifications and coercion) is placed in
+ * separate procedures indicated by typsubshandler. There is only one exception
+ * for now about domain-over-container: if the source container is of a
+ * domain-over-container type, the result is of the base container type or its
+ * element type; essentially, we must fold a domain to its base type before
+ * applying subscripting. (Note that int2vector and oidvector are treated as
+ * domains here.) An error will appear in the case the current container type
+ * doesn't have a subscripting procedure.
*
* pstate Parse state
* containerBase Already-transformed expression for the container as a whole
@@ -284,16 +261,12 @@ transformContainerSubscripts(ParseState *pstate,
bool isSlice = false;
List *upperIndexpr = NIL;
List *lowerIndexpr = NIL;
+ List *indexprSlice = NIL;
ListCell *idx;
SubscriptingRef *sbsref;
- /*
- * Caller may or may not have bothered to determine elementType. Note
- * that if the caller did do so, containerType/containerTypMod must be as
- * modified by transformContainerType, ie, smash domain to base type.
- */
- if (!OidIsValid(elementType))
- elementType = transformContainerType(&containerType, &containerTypMod);
+ /* Identify the actual container type and element type involved */
+ transformContainerType(&containerType, &containerTypMod);
/*
* A list containing only simple subscripts refers to a single container
@@ -327,29 +300,6 @@ transformContainerSubscripts(ParseState *pstate,
if (ai->lidx)
{
subexpr = transformExpr(pstate, ai->lidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->lidx))));
- }
- else if (!ai->is_slice)
- {
- /* Make a constant 1 */
- subexpr = (Node *) makeConst(INT4OID,
- -1,
- InvalidOid,
- sizeof(int32),
- Int32GetDatum(1),
- false,
- true); /* pass by value */
}
else
{
@@ -357,63 +307,23 @@ transformContainerSubscripts(ParseState *pstate,
subexpr = NULL;
}
lowerIndexpr = lappend(lowerIndexpr, subexpr);
+ indexprSlice = lappend(indexprSlice, ai);
}
else
Assert(ai->lidx == NULL && !ai->is_slice);
if (ai->uidx)
- {
subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
- /* If it's not int4 already, try to coerce */
- subexpr = coerce_to_target_type(pstate,
- subexpr, exprType(subexpr),
- INT4OID, -1,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (subexpr == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array subscript must have type integer"),
- parser_errposition(pstate, exprLocation(ai->uidx))));
- }
else
{
/* Slice with omitted upper bound, put NULL into the list */
Assert(isSlice && ai->is_slice);
subexpr = NULL;
}
+ subexpr = transformExpr(pstate, ai->uidx, pstate->p_expr_kind);
upperIndexpr = lappend(upperIndexpr, subexpr);
}
- /*
- * If doing an array store, coerce the source value to the right type.
- * (This should agree with the coercion done by transformAssignedExpr.)
- */
- if (assignFrom != NULL)
- {
- Oid typesource = exprType(assignFrom);
- Oid typeneeded = isSlice ? containerType : elementType;
- Node *newFrom;
-
- newFrom = coerce_to_target_type(pstate,
- assignFrom, typesource,
- typeneeded, containerTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (newFrom == NULL)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment requires type %s"
- " but expression is of type %s",
- format_type_be(typeneeded),
- format_type_be(typesource)),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, exprLocation(assignFrom))));
- assignFrom = newFrom;
- }
-
/*
* Ready to build the SubscriptingRef node.
*/
@@ -422,17 +332,30 @@ transformContainerSubscripts(ParseState *pstate,
sbsref->refassgnexpr = (Expr *) assignFrom;
sbsref->refcontainertype = containerType;
- sbsref->refelemtype = elementType;
sbsref->reftypmod = containerTypMod;
/* refcollid will be set by parse_collate.c */
sbsref->refupperindexpr = upperIndexpr;
sbsref->reflowerindexpr = lowerIndexpr;
+ sbsref->refindexprslice = indexprSlice;
sbsref->refexpr = (Expr *) containerBase;
- sbsref->refassgnexpr = (Expr *) assignFrom;
return sbsref;
}
+SubscriptRoutines*
+getSubscriptingRoutines(Oid containerType)
+{
+ RegProcedure typsubshandler = get_typsubsprocs(containerType);
+
+ if (!OidIsValid(typsubshandler))
+ ereport(ERROR,
+ (errcode(ERRCODE_DATATYPE_MISMATCH),
+ errmsg("cannot subscript type %s because it does not support subscripting",
+ format_type_be(containerType))));
+
+ return (SubscriptRoutines *) OidFunctionCall0(typsubshandler);
+}
+
/*
* make_const
*
diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 566c517837..d7483c6538 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -685,7 +685,7 @@ transformAssignmentIndirection(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
+ Node *result = NULL;
List *subscripts = NIL;
bool isSlice = false;
ListCell *i;
@@ -848,27 +848,21 @@ transformAssignmentIndirection(ParseState *pstate,
location);
}
- /* base case: just coerce RHS to match target type ID */
-
- result = coerce_to_target_type(pstate,
- rhs, exprType(rhs),
- targetTypeId, targetTypMod,
- COERCION_ASSIGNMENT,
- COERCE_IMPLICIT_CAST,
- -1);
- if (result == NULL)
+ /*
+ * Base case: just coerce RHS to match target type ID.
+ * It's necessary only for field selection, since for
+ * subscripting its custom code should define types.
+ */
+ if (!targetIsSubscripting)
{
- if (targetIsSubscripting)
- ereport(ERROR,
- (errcode(ERRCODE_DATATYPE_MISMATCH),
- errmsg("array assignment to \"%s\" requires type %s"
- " but expression is of type %s",
- targetName,
- format_type_be(targetTypeId),
- format_type_be(exprType(rhs))),
- errhint("You will need to rewrite or cast the expression."),
- parser_errposition(pstate, location)));
- else
+ result = coerce_to_target_type(pstate,
+ rhs, exprType(rhs),
+ targetTypeId, targetTypMod,
+ COERCION_ASSIGNMENT,
+ COERCE_IMPLICIT_CAST,
+ -1);
+
+ if (result == NULL)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("subfield \"%s\" is of type %s"
@@ -900,29 +894,42 @@ transformAssignmentSubscripts(ParseState *pstate,
Node *rhs,
int location)
{
- Node *result;
- Oid containerType;
- int32 containerTypMod;
- Oid elementTypeId;
- Oid typeNeeded;
- Oid collationNeeded;
+ Node *result;
+ Oid containerType;
+ int32 containerTypMod;
+ Oid collationNeeded;
+ SubscriptingRef *sbsref;
+ SubscriptRoutines *sbsroutines;
Assert(subscripts != NIL);
/* Identify the actual array type and element type involved */
containerType = targetTypeId;
containerTypMod = targetTypMod;
- elementTypeId = transformContainerType(&containerType, &containerTypMod);
- /* Identify type that RHS must provide */
- typeNeeded = isSlice ? containerType : elementTypeId;
+ /* process subscripts */
+ sbsref = transformContainerSubscripts(pstate,
+ basenode,
+ containerType,
+ exprType(rhs),
+ containerTypMod,
+ subscripts,
+ rhs);
+
+ sbsroutines = getSubscriptingRoutines(sbsref->refcontainertype);
+
+ /*
+ * Let custom code provide necessary information about required types:
+ * refelemtype and refassgntype
+ */
+ sbsref = sbsroutines->prepare(rhs != NULL, sbsref);
/*
* container normally has same collation as elements, but there's an
* exception: we might be subscripting a domain over a container type. In
* that case use collation of the base type.
*/
- if (containerType == targetTypeId)
+ if (sbsref->refcontainertype == containerType)
collationNeeded = targetCollation;
else
collationNeeded = get_typcollation(containerType);
@@ -932,25 +939,22 @@ transformAssignmentSubscripts(ParseState *pstate,
NULL,
targetName,
true,
- typeNeeded,
- containerTypMod,
+ sbsref->refassgntype,
+ sbsref->reftypmod,
collationNeeded,
indirection,
next_indirection,
rhs,
location);
- /* process subscripts */
- result = (Node *) transformContainerSubscripts(pstate,
- basenode,
- containerType,
- elementTypeId,
- containerTypMod,
- subscripts,
- rhs);
+ /* Provide fully prepared subscripting information for custom validation */
+ sbsref->refassgnexpr = (Expr *) rhs;
+ sbsroutines->validate(rhs != NULL, sbsref, pstate);
+
+ result = (Node *) sbsref;
/* If target was a domain over container, need to coerce up to the domain */
- if (containerType != targetTypeId)
+ if (sbsref->refcontainertype != targetTypeId)
{
Oid resulttype = exprType(result);
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 2cbcb4b85e..fb298c11c2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -7994,17 +7994,18 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
- /*
- * If there's a refassgnexpr, we want to print the node in the
- * format "container[subscripts] := refassgnexpr". This is
- * not legal SQL, so decompilation of INSERT or UPDATE
- * statements should always use processIndirection as part of
- * the statement-level syntax. We should only see this when
- * EXPLAIN tries to print the targetlist of a plan resulting
- * from such a statement.
- */
- if (sbsref->refassgnexpr)
+ if (IsAssignment(sbsref))
{
+ /*
+ * If there's a refassgnexpr, we want to print the node in the
+ * format "container[subscripts] := refassgnexpr". This is not
+ * legal SQL, so decompilation of INSERT or UPDATE statements
+ * should always use processIndirection as part of the
+ * statement-level syntax. We should only see this when
+ * EXPLAIN tries to print the targetlist of a plan resulting
+ * from such a statement.
+ */
+
Node *refassgnexpr;
/*
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index f3bf413829..fb264a1e57 100644
--- a/src/backend/utils/cache/lsyscache.c
+++ b/src/backend/utils/cache/lsyscache.c
@@ -3273,6 +3273,29 @@ get_range_collation(Oid rangeOid)
return InvalidOid;
}
+/*
+ * get_typsubshandler
+ *
+ * Given the type OID, return the type's subscripting procedures, if any,
+ * through pointers in arguments.
+ */
+RegProcedure
+get_typsubsprocs(Oid typid)
+{
+ HeapTuple tp;
+
+ tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
+ if (HeapTupleIsValid(tp))
+ {
+ RegProcedure handler = ((Form_pg_type) GETSTRUCT(tp))->typsubshandler;
+ ReleaseSysCache(tp);
+
+ return handler;
+ }
+ else
+ return InvalidOid;
+}
+
/* ---------- PG_INDEX CACHE ---------- */
/*
diff --git a/src/include/c.h b/src/include/c.h
index f242e32edb..108e424df7 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -545,6 +545,8 @@ typedef struct
int indx[MAXDIM];
} IntArray;
+#define MAX_SUBSCRIPT_DEPTH 12
+
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
diff --git a/src/include/catalog/pg_type.h b/src/include/catalog/pg_type.h
index 7b37562648..ea237ec61d 100644
--- a/src/include/catalog/pg_type.h
+++ b/src/include/catalog/pg_type.h
@@ -221,6 +221,12 @@ CATALOG(pg_type,1247,TypeRelationId) BKI_BOOTSTRAP BKI_ROWTYPE_OID(71,TypeRelati
*/
Oid typcollation BKI_DEFAULT(0) BKI_LOOKUP(pg_collation);
+ /*
+ * Type specific subscripting logic. If typsubshandler is NULL, it means
+ * that this type doesn't support subscripting.
+ */
+ regproc typsubshandler BKI_DEFAULT(-) BKI_LOOKUP(pg_proc);
+
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/*
@@ -349,7 +355,8 @@ extern ObjectAddress TypeCreate(Oid newTypeOid,
int32 typeMod,
int32 typNDims,
bool typeNotNull,
- Oid typeCollation);
+ Oid typeCollation,
+ Oid subscriptingParseProcedure);
extern void GenerateTypeDependencies(HeapTuple typeTuple,
Relation typeCatalog,
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h
index dbe8649a57..52c357b2aa 100644
--- a/src/include/executor/execExpr.h
+++ b/src/include/executor/execExpr.h
@@ -19,7 +19,7 @@
/* forward references to avoid circularity */
struct ExprEvalStep;
-struct SubscriptingRefState;
+struct SubscriptRoutines;
/* Bits in ExprState->flags (see also execnodes.h for public flag bits): */
/* expression's interpreter has been initialized */
@@ -658,13 +658,13 @@ typedef struct SubscriptingRefState
/* numupper and upperprovided[] are filled at compile time */
/* at runtime, extracted subscript datums get stored in upperindex[] */
int numupper;
- bool upperprovided[MAXDIM];
- int upperindex[MAXDIM];
+ bool upperprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum upperindex[MAX_SUBSCRIPT_DEPTH];
/* similarly for lower indexes, if any */
int numlower;
- bool lowerprovided[MAXDIM];
- int lowerindex[MAXDIM];
+ bool lowerprovided[MAX_SUBSCRIPT_DEPTH];
+ Datum lowerindex[MAX_SUBSCRIPT_DEPTH];
/* subscript expressions get evaluated into here */
Datum subscriptvalue;
@@ -677,6 +677,9 @@ typedef struct SubscriptingRefState
/* if we have a nested assignment, SBSREF_OLD puts old value here */
Datum prevvalue;
bool prevnull;
+
+ bool resnull;
+ struct SubscriptRoutines *sbsroutines;
} SubscriptingRefState;
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index d73be2ad46..5991f437cd 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -417,13 +417,17 @@ typedef struct SubscriptingRef
Expr xpr;
Oid refcontainertype; /* type of the container proper */
Oid refelemtype; /* type of the container elements */
+ Oid refassgntype; /* type of assignment expr that is required */
int32 reftypmod; /* typmod of the container (and elements too) */
Oid refcollid; /* OID of collation, or InvalidOid if none */
+ Oid refnestedfunc; /* OID of type-specific function to handle nested assignment */
List *refupperindexpr; /* expressions that evaluate to upper
* container indexes */
List *reflowerindexpr; /* expressions that evaluate to lower
* container indexes, or NIL for single
* container element */
+ List *refindexprslice; /* whether or not related indexpr from
+ * reflowerindexpr is a slice */
Expr *refexpr; /* the expression that evaluates to a
* container value */
@@ -431,6 +435,8 @@ typedef struct SubscriptingRef
* fetch */
} SubscriptingRef;
+#define IsAssignment(expr) ( ((SubscriptingRef*) expr)->refassgnexpr != NULL )
+
/*
* CoercionContext - distinguishes the allowed set of type casts
*
diff --git a/src/include/nodes/subscripting.h b/src/include/nodes/subscripting.h
new file mode 100644
index 0000000000..1800d5ecf5
--- /dev/null
+++ b/src/include/nodes/subscripting.h
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * subscripting.h
+ * API for generic type subscripting
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/nodes/subscripting.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SUBSCRIPTING_H
+#define SUBSCRIPTING_H
+
+#include "parser/parse_node.h"
+#include "nodes/primnodes.h"
+
+struct ParseState;
+struct SubscriptingRefState;
+
+/* Callback function signatures --- see xsubscripting.sgml for more info. */
+typedef SubscriptingRef * (*SubscriptingPrepare) (bool isAssignment, SubscriptingRef *sbsef);
+
+typedef SubscriptingRef * (*SubscriptingValidate) (bool isAssignment, SubscriptingRef *sbsef,
+ struct ParseState *pstate);
+
+typedef Datum (*SubscriptingFetch) (Datum source, struct SubscriptingRefState *sbsrefstate);
+
+typedef Datum (*SubscriptingAssign) (Datum source, struct SubscriptingRefState *sbrsefstate);
+
+typedef struct SubscriptRoutines
+{
+ SubscriptingPrepare prepare;
+ SubscriptingValidate validate;
+ SubscriptingFetch fetch;
+ SubscriptingAssign assign;
+
+} SubscriptRoutines;
+
+
+#endif /* SUBSCRIPTING_H */
diff --git a/src/include/parser/parse_node.h b/src/include/parser/parse_node.h
index d25819aa28..b4736206d1 100644
--- a/src/include/parser/parse_node.h
+++ b/src/include/parser/parse_node.h
@@ -15,6 +15,7 @@
#define PARSE_NODE_H
#include "nodes/parsenodes.h"
+#include "nodes/subscripting.h"
#include "utils/queryenvironment.h"
#include "utils/relcache.h"
@@ -313,7 +314,9 @@ extern void setup_parser_errposition_callback(ParseCallbackState *pcbstate,
ParseState *pstate, int location);
extern void cancel_parser_errposition_callback(ParseCallbackState *pcbstate);
-extern Oid transformContainerType(Oid *containerType, int32 *containerTypmod);
+extern Var *make_var(ParseState *pstate, RangeTblEntry *rte, int attrno,
+ int location);
+extern void transformContainerType(Oid *containerType, int32 *containerTypmod);
extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
Node *containerBase,
@@ -322,6 +325,7 @@ extern SubscriptingRef *transformContainerSubscripts(ParseState *pstate,
int32 containerTypMod,
List *indirection,
Node *assignFrom);
+extern SubscriptRoutines *getSubscriptingRoutines(Oid containerType);
extern Const *make_const(ParseState *pstate, Value *value, int location);
#endif /* PARSE_NODE_H */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index fecfe1f4f6..8fc570d2e1 100644
--- a/src/include/utils/lsyscache.h
+++ b/src/include/utils/lsyscache.h
@@ -183,6 +183,7 @@ extern char *get_namespace_name(Oid nspid);
extern char *get_namespace_name_or_temp(Oid nspid);
extern Oid get_range_subtype(Oid rangeOid);
extern Oid get_range_collation(Oid rangeOid);
+extern RegProcedure get_typsubsprocs(Oid typid);
extern Oid get_index_column_opclass(Oid index_oid, int attno);
extern bool get_index_isreplident(Oid index_oid);
extern bool get_index_isvalid(Oid index_oid);
--
2.21.0
--u66dlpg6gaevsofr
Content-Type: text/x-diff; charset=us-ascii
Content-Disposition: attachment;
filename="v33-0002-Subscripting-for-array.patch"
^ permalink raw reply [nested|flat] 31+ messages in thread
* Add callback in pgstats for backend initialization
@ 2024-09-03 01:52 Michael Paquier <[email protected]>
2024-09-03 05:00 ` Re: Add callback in pgstats for backend initialization Bertrand Drouvot <[email protected]>
0 siblings, 1 reply; 31+ messages in thread
From: Michael Paquier @ 2024-09-03 01:52 UTC (permalink / raw)
To: Postgres hackers <[email protected]>
Hi all,
Currently, the backend-level initialization of pgstats happens in
pgstat_initialize(), where we are using a shortcut for the WAL stats,
with pgstat_init_wal().
I'd like to propose to add a callback for that, so as in-core or
custom pgstats kinds can assign custom actions when initializing a
backend. The use-case I had for this one are pretty close to what we
do for WAL, where we would rely on a difference of state depending on
what may have existed before reaching the initialization path. So
this can offer more precision. Another case, perhaps less
interesting, is to be able to initialize some static backend state.
I wanted to get that sent for the current commit fest, but did not get
back in time to it. Anyway, here it is. This gives the simple patch
attached.
Thanks,
--
Michael
Attachments:
[text/x-diff] 0001-Add-callback-for-backend-initialization-in-pgstats.patch (2.9K, ../../[email protected]/2-0001-Add-callback-for-backend-initialization-in-pgstats.patch)
download | inline diff:
From 1e41a5155fb689f1d4ae8a5cfb244b824e913bae Mon Sep 17 00:00:00 2001
From: Michael Paquier <[email protected]>
Date: Tue, 3 Sep 2024 10:38:15 +0900
Subject: [PATCH] Add callback for backend initialization in pgstats
This is currently used by the WAL stats, and is now made available for
others as well.
---
src/include/utils/pgstat_internal.h | 7 +++++++
src/backend/utils/activity/pgstat.c | 14 ++++++++++++--
src/backend/utils/activity/pgstat_wal.c | 2 +-
3 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/src/include/utils/pgstat_internal.h b/src/include/utils/pgstat_internal.h
index fb132e439d..53f7d5c98c 100644
--- a/src/include/utils/pgstat_internal.h
+++ b/src/include/utils/pgstat_internal.h
@@ -229,6 +229,12 @@ typedef struct PgStat_KindInfo
*/
uint32 pending_size;
+ /*
+ * Perform custom actions when initializing a backend (standalone or under
+ * postmaster). Optional.
+ */
+ void (*init_backend_cb) (void);
+
/*
* For variable-numbered stats: flush pending stats. Required if pending
* data is used.
@@ -676,6 +682,7 @@ extern bool pgstat_flush_wal(bool nowait);
extern void pgstat_init_wal(void);
extern bool pgstat_have_pending_wal(void);
+extern void pgstat_wal_init_backend_cb(void);
extern void pgstat_wal_init_shmem_cb(void *stats);
extern void pgstat_wal_reset_all_cb(TimestampTz ts);
extern void pgstat_wal_snapshot_cb(void);
diff --git a/src/backend/utils/activity/pgstat.c b/src/backend/utils/activity/pgstat.c
index b2ca3f39b7..3b6983ff5d 100644
--- a/src/backend/utils/activity/pgstat.c
+++ b/src/backend/utils/activity/pgstat.c
@@ -441,6 +441,7 @@ static const PgStat_KindInfo pgstat_kind_builtin_infos[PGSTAT_KIND_BUILTIN_SIZE]
.shared_data_off = offsetof(PgStatShared_Wal, stats),
.shared_data_len = sizeof(((PgStatShared_Wal *) 0)->stats),
+ .init_backend_cb = pgstat_wal_init_backend_cb,
.init_shmem_cb = pgstat_wal_init_shmem_cb,
.reset_all_cb = pgstat_wal_reset_all_cb,
.snapshot_cb = pgstat_wal_snapshot_cb,
@@ -604,10 +605,19 @@ pgstat_initialize(void)
pgstat_attach_shmem();
- pgstat_init_wal();
-
pgstat_init_snapshot_fixed();
+ /* Backend initialization callbacks */
+ for (PgStat_Kind kind = PGSTAT_KIND_MIN; kind <= PGSTAT_KIND_MAX; kind++)
+ {
+ const PgStat_KindInfo *kind_info = pgstat_get_kind_info(kind);
+
+ if (kind_info == NULL || kind_info->init_backend_cb == NULL)
+ continue;
+
+ kind_info->init_backend_cb();
+ }
+
/* Set up a process-exit hook to clean up */
before_shmem_exit(pgstat_shutdown_hook, 0);
diff --git a/src/backend/utils/activity/pgstat_wal.c b/src/backend/utils/activity/pgstat_wal.c
index e2a3f6b865..8c19c3f2fd 100644
--- a/src/backend/utils/activity/pgstat_wal.c
+++ b/src/backend/utils/activity/pgstat_wal.c
@@ -138,7 +138,7 @@ pgstat_flush_wal(bool nowait)
}
void
-pgstat_init_wal(void)
+pgstat_wal_init_backend_cb(void)
{
/*
* Initialize prevWalUsage with pgWalUsage so that pgstat_flush_wal() can
--
2.45.2
[application/pgp-signature] signature.asc (833B, ../../[email protected]/3-signature.asc)
download
^ permalink raw reply [nested|flat] 31+ messages in thread
* Re: Add callback in pgstats for backend initialization
2024-09-03 01:52 Add callback in pgstats for backend initialization Michael Paquier <[email protected]>
@ 2024-09-03 05:00 ` Bertrand Drouvot <[email protected]>
2024-09-03 05:58 ` Re: Add callback in pgstats for backend initialization Michael Paquier <[email protected]>
2024-09-04 05:15 ` Re: Add callback in pgstats for backend initialization Kyotaro Horiguchi <[email protected]>
0 siblings, 2 replies; 31+ messages in thread
From: Bertrand Drouvot @ 2024-09-03 05:00 UTC (permalink / raw)
To: Michael Paquier <[email protected]>; +Cc: Postgres hackers <[email protected]>
Hi,
On Tue, Sep 03, 2024 at 10:52:20AM +0900, Michael Paquier wrote:
> Hi all,
>
> Currently, the backend-level initialization of pgstats happens in
> pgstat_initialize(), where we are using a shortcut for the WAL stats,
> with pgstat_init_wal().
>
> I'd like to propose to add a callback for that, so as in-core or
> custom pgstats kinds can assign custom actions when initializing a
> backend. The use-case I had for this one are pretty close to what we
> do for WAL, where we would rely on a difference of state depending on
> what may have existed before reaching the initialization path. So
> this can offer more precision. Another case, perhaps less
> interesting, is to be able to initialize some static backend state.
I think the proposal makes sense and I can see the use cases too, so +1.
> This gives the simple patch
> attached.
Should we add a few words about this new callback (and the others in
PgStat_KindInfo while at it) in the "Custom Cumulative Statistics" section of
xfunc.sgml?
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
^ permalink raw reply [nested|flat] 31+ messages in thread
* Re: Add callback in pgstats for backend initialization
2024-09-03 01:52 Add callback in pgstats for backend initialization Michael Paquier <[email protected]>
2024-09-03 05:00 ` Re: Add callback in pgstats for backend initialization Bertrand Drouvot <[email protected]>
@ 2024-09-03 05:58 ` Michael Paquier <[email protected]>
1 sibling, 0 replies; 31+ messages in thread
From: Michael Paquier @ 2024-09-03 05:58 UTC (permalink / raw)
To: Bertrand Drouvot <[email protected]>; +Cc: Postgres hackers <[email protected]>
On Tue, Sep 03, 2024 at 05:00:54AM +0000, Bertrand Drouvot wrote:
> Should we add a few words about this new callback (and the others in
> PgStat_KindInfo while at it) in the "Custom Cumulative Statistics" section of
> xfunc.sgml?
Not sure if it is worth having. This adds extra maintenance and
there's already a mention of src/include/utils/pgstat_internal.h
telling where the callbacks are described.
--
Michael
Attachments:
[application/pgp-signature] signature.asc (833B, ../../[email protected]/2-signature.asc)
download
^ permalink raw reply [nested|flat] 31+ messages in thread
* Re: Add callback in pgstats for backend initialization
2024-09-03 01:52 Add callback in pgstats for backend initialization Michael Paquier <[email protected]>
2024-09-03 05:00 ` Re: Add callback in pgstats for backend initialization Bertrand Drouvot <[email protected]>
@ 2024-09-04 05:15 ` Kyotaro Horiguchi <[email protected]>
1 sibling, 0 replies; 31+ messages in thread
From: Kyotaro Horiguchi @ 2024-09-04 05:15 UTC (permalink / raw)
To: [email protected]; +Cc: [email protected]; [email protected]
At Tue, 3 Sep 2024 05:00:54 +0000, Bertrand Drouvot <[email protected]> wrote in
> Hi,
>
> On Tue, Sep 03, 2024 at 10:52:20AM +0900, Michael Paquier wrote:
> > Hi all,
> >
> > Currently, the backend-level initialization of pgstats happens in
> > pgstat_initialize(), where we are using a shortcut for the WAL stats,
> > with pgstat_init_wal().
> >
> > I'd like to propose to add a callback for that, so as in-core or
> > custom pgstats kinds can assign custom actions when initializing a
> > backend. The use-case I had for this one are pretty close to what we
> > do for WAL, where we would rely on a difference of state depending on
> > what may have existed before reaching the initialization path. So
> > this can offer more precision. Another case, perhaps less
> > interesting, is to be able to initialize some static backend state.
>
> I think the proposal makes sense and I can see the use cases too, so +1.
+1, too.
The name "init_backend" makes it sound like the function initializes
the backend. backend_init might be a better choice, but I'm not sure.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
^ permalink raw reply [nested|flat] 31+ messages in thread
end of thread, other threads:[~2024-09-04 05:15 UTC | newest]
Thread overview: 31+ messages (download: mbox mbox.gz follow: Atom feed)
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2024-09-03 01:52 Add callback in pgstats for backend initialization Michael Paquier <[email protected]>
2024-09-03 05:00 ` Re: Add callback in pgstats for backend initialization Bertrand Drouvot <[email protected]>
2024-09-03 05:58 ` Re: Add callback in pgstats for backend initialization Michael Paquier <[email protected]>
2024-09-04 05:15 ` Re: Add callback in pgstats for backend initialization Kyotaro Horiguchi <[email protected]>
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