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Make SubPlan nodes carry the result's typmod as well as datatype OID. This is 

for consistency with the (relatively) recent addition of typmod to SubLink.
An example of why it's a good idea is to be seen in the recent "failed to
locate grouping columns" bug, which wouldn't have happened if a SubPlan
exposed the same typmod info as the SubLink it was derived from.

This could be back-patched, since it doesn't affect any on-disk data format,
but for the moment it doesn't seem necessary to do so.
This commit is contained in:
Tom Lane 2009-03-10 22:09:26 +00:00
parent 4886dc92e0
commit dcf3902f02
6 changed files with 55 additions and 26 deletions
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3
src/backend/nodes/copyfuncs.c
View File

@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.425 2009/02/25 03:30:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.426 2009/03/10 22:09:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1113,6 +1113,7 @@ _copySubPlan(SubPlan *from)
COPY_NODE_FIELD(paramIds);
COPY_SCALAR_FIELD(plan_id);
COPY_SCALAR_FIELD(firstColType);
COPY_SCALAR_FIELD(firstColTypmod);
COPY_SCALAR_FIELD(useHashTable);
COPY_SCALAR_FIELD(unknownEqFalse);
COPY_NODE_FIELD(setParam);

3
src/backend/nodes/equalfuncs.c
View File

@ -22,7 +22,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.349 2009/02/25 03:30:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.350 2009/03/10 22:09:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -342,6 +342,7 @@ _equalSubPlan(SubPlan *a, SubPlan *b)
COMPARE_NODE_FIELD(paramIds);
COMPARE_SCALAR_FIELD(plan_id);
COMPARE_SCALAR_FIELD(firstColType);
COMPARE_SCALAR_FIELD(firstColTypmod);
COMPARE_SCALAR_FIELD(useHashTable);
COMPARE_SCALAR_FIELD(unknownEqFalse);
COMPARE_NODE_FIELD(setParam);

40
src/backend/nodes/nodeFuncs.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/nodeFuncs.c,v 1.38 2009/02/25 03:30:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/nodeFuncs.c,v 1.39 2009/03/10 22:09:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -28,7 +28,7 @@ static int leftmostLoc(int loc1, int loc2);
/*
* exprType -
* returns the Oid of the type of the expression. (Used for typechecking.)
* returns the Oid of the type of the expression's result.
*/
Oid
exprType(Node *expr)
@ -117,11 +117,6 @@ exprType(Node *expr)
break;
case T_SubPlan:
{
/*
* Although the parser does not ever deal with already-planned
* expression trees, we support SubPlan nodes in this routine
* for the convenience of ruleutils.c.
*/
SubPlan *subplan = (SubPlan *) expr;
if (subplan->subLinkType == EXPR_SUBLINK ||
@ -148,7 +143,6 @@ exprType(Node *expr)
break;
case T_AlternativeSubPlan:
{
/* As above, supported for the convenience of ruleutils.c */
AlternativeSubPlan *asplan = (AlternativeSubPlan *) expr;
/* subplans should all return the same thing */
@ -236,8 +230,8 @@ exprType(Node *expr)
/*
* exprTypmod -
* returns the type-specific attrmod of the expression, if it can be
* determined. In most cases, it can't and we return -1.
* returns the type-specific modifier of the expression's result type,
* if it can be determined. In many cases, it can't and we return -1.
*/
int32
exprTypmod(Node *expr)
@ -286,6 +280,32 @@ exprTypmod(Node *expr)
}
}
break;
case T_SubPlan:
{
SubPlan *subplan = (SubPlan *) expr;
if (subplan->subLinkType == EXPR_SUBLINK ||
subplan->subLinkType == ARRAY_SUBLINK)
{
/* get the typmod of the subselect's first target column */
/* note we don't need to care if it's an array */
return subplan->firstColTypmod;
}
else
{
/* for all other subplan types, result is boolean */
return -1;
}
}
break;
case T_AlternativeSubPlan:
{
AlternativeSubPlan *asplan = (AlternativeSubPlan *) expr;
/* subplans should all return the same thing */
return exprTypmod((Node *) linitial(asplan->subplans));
}
break;
case T_FieldSelect:
return ((FieldSelect *) expr)->resulttypmod;
case T_RelabelType:

3
src/backend/nodes/outfuncs.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.353 2009/02/25 03:30:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.354 2009/03/10 22:09:25 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -957,6 +957,7 @@ _outSubPlan(StringInfo str, SubPlan *node)
WRITE_NODE_FIELD(paramIds);
WRITE_INT_FIELD(plan_id);
WRITE_OID_FIELD(firstColType);
WRITE_INT_FIELD(firstColTypmod);
WRITE_BOOL_FIELD(useHashTable);
WRITE_BOOL_FIELD(unknownEqFalse);
WRITE_NODE_FIELD(setParam);

29
src/backend/optimizer/plan/subselect.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.146 2009/02/25 03:30:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.147 2009/03/10 22:09:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -229,13 +229,13 @@ SS_assign_worktable_param(PlannerInfo *root)
/*
* Get the datatype of the first column of the plan's output.
*
* This is stored for ARRAY_SUBLINK and for exprType(), which doesn't have any
* way to get at the plan associated with a SubPlan node. We really only need
* the value for EXPR_SUBLINK and ARRAY_SUBLINK subplans, but for consistency
* we set it always.
* This is stored for ARRAY_SUBLINK execution and for exprType()/exprTypmod(),
* which have no way to get at the plan associated with a SubPlan node.
* We really only need the info for EXPR_SUBLINK and ARRAY_SUBLINK subplans,
* but for consistency we save it always.
*/
static Oid
get_first_col_type(Plan *plan)
static void
get_first_col_type(Plan *plan, Oid *coltype, int32 *coltypmod)
{
/* In cases such as EXISTS, tlist might be empty; arbitrarily use VOID */
if (plan->targetlist)
@ -244,9 +244,14 @@ get_first_col_type(Plan *plan)
Assert(IsA(tent, TargetEntry));
if (!tent->resjunk)
return exprType((Node *) tent->expr);
{
*coltype = exprType((Node *) tent->expr);
*coltypmod = exprTypmod((Node *) tent->expr);
return;
}
}
return VOIDOID;
*coltype = VOIDOID;
*coltypmod = -1;
}
/*
@ -414,7 +419,7 @@ build_subplan(PlannerInfo *root, Plan *plan, List *rtable,
splan->subLinkType = subLinkType;
splan->testexpr = NULL;
splan->paramIds = NIL;
splan->firstColType = get_first_col_type(plan);
get_first_col_type(plan, &splan->firstColType, &splan->firstColTypmod);
splan->useHashTable = false;
splan->unknownEqFalse = unknownEqFalse;
splan->setParam = NIL;
@ -876,7 +881,7 @@ SS_process_ctes(PlannerInfo *root)
splan->subLinkType = CTE_SUBLINK;
splan->testexpr = NULL;
splan->paramIds = NIL;
splan->firstColType = get_first_col_type(plan);
get_first_col_type(plan, &splan->firstColType, &splan->firstColTypmod);
splan->useHashTable = false;
splan->unknownEqFalse = false;
splan->setParam = NIL;
@ -2111,7 +2116,7 @@ SS_make_initplan_from_plan(PlannerInfo *root, Plan *plan,
*/
node = makeNode(SubPlan);
node->subLinkType = EXPR_SUBLINK;
node->firstColType = get_first_col_type(plan);
get_first_col_type(plan, &node->firstColType, &node->firstColTypmod);
node->plan_id = list_length(root->glob->subplans);
root->init_plans = lappend(root->init_plans, node);

3
src/include/nodes/primnodes.h
View File

@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.146 2009/02/25 03:30:37 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.147 2009/03/10 22:09:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -504,6 +504,7 @@ typedef struct SubPlan
int plan_id; /* Index (from 1) in PlannedStmt.subplans */
/* Extra data useful for determining subplan's output type: */
Oid firstColType; /* Type of first column of subplan result */
int32 firstColTypmod; /* Typmod of first column of subplan result */
/* Information about execution strategy: */
bool useHashTable; /* TRUE to store subselect output in a hash
* table (implies we are doing "IN") */