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build_subquery_pathkeys() was examining wrong copy of subquery target list,

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causing it to fail to recognize the output ordering of subqueries that
contain set operations (UNION/INTERSECT/EXPECT).  Per example from Karel Zak.
This commit is contained in:
Tom Lane 2004-04-07 17:42:28 +00:00
parent f1d0269861
commit 5d1af6aee3
1 changed files with 3 additions and 2 deletions
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5
src/backend/optimizer/path/pathkeys.c
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@ -11,7 +11,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/pathkeys.c,v 1.55 2003/12/03 17:45:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/pathkeys.c,v 1.56 2004/04/07 17:42:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -757,6 +757,7 @@ build_subquery_pathkeys(Query *root, RelOptInfo *rel, Query *subquery)
List *retval = NIL;
int retvallen = 0;
int outer_query_keys = length(root->query_pathkeys);
List *sub_tlist = rel->subplan->targetlist;
List *l;
foreach(l, subquery->query_pathkeys)
@ -789,7 +790,7 @@ build_subquery_pathkeys(Query *root, RelOptInfo *rel, Query *subquery)
Node *sub_key = sub_item->key;
List *k;
foreach(k, subquery->targetList)
foreach(k, sub_tlist)
{
TargetEntry *tle = (TargetEntry *) lfirst(k);