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Suppress subquery pullup and pushdown when the subquery has any

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set-returning functions in its target list.  This ensures that we
won't rewrite the query in a way that places set-returning functions
into quals (WHERE clauses).  Cf. bug reports from Joe Conway.
This commit is contained in:
Tom Lane
2001-12-10 22:54:12 +00:00
parent 584f818bef
commit 63cc56de54
4 changed files with 59 additions and 6 deletions
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11
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.113 2001/11/05 17:46:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.114 2001/12/10 22:54:12 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -461,6 +461,15 @@ is_simple_subquery(Query *subquery)
subquery->limitCount)
return false;
/*
* Don't pull up a subquery that has any set-returning functions in
* its targetlist. Otherwise we might well wind up inserting
* set-returning functions into places where they mustn't go,
* such as quals of higher queries.
*/
if (contain_iter_clause((Node *) subquery->targetList))
return false;
/*
* Hack: don't try to pull up a subquery with an empty jointree.
* query_planner() will correctly generate a Result plan for a