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

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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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29
src/backend/optimizer/plan/subselect.c
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@ -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);