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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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40
src/backend/nodes/nodeFuncs.c
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@ -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: