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Fix more problems with rewriter failing to set Query.hasSubLinks when inserting

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a SubLink expression into a rule query.  We missed cases where the original
query contained a sub-SELECT in a function in FROM, a multi-row VALUES list,
or a RETURNING list.  Per bug #4434 from Dean Rasheed and subsequent
investigation.

Back-patch to 8.1; older releases don't have the issue because they didn't
try to be smart about setting hasSubLinks only when needed.
This commit is contained in:
Tom Lane
2008-09-24 16:53:07 +00:00
parent 00f3091e60
commit cd311af46e
1 changed files with 28 additions and 1 deletions
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29
src/backend/rewrite/rewriteHandler.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/rewrite/rewriteHandler.c,v 1.158.2.3 2007/03/01 18:50:42 tgl Exp $
* $PostgreSQL: pgsql/src/backend/rewrite/rewriteHandler.c,v 1.158.2.4 2008/09/24 16:53:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -334,6 +334,33 @@ rewriteRuleAction(Query *parsetree,
sub_action->rtable = list_concat((List *) copyObject(parsetree->rtable),
sub_action->rtable);
/*
* There could have been some SubLinks in parsetree's rtable, in which
* case we'd better mark the sub_action correctly.
*/
if (parsetree->hasSubLinks && !sub_action->hasSubLinks)
{
ListCell *lc;
foreach(lc, parsetree->rtable)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
switch (rte->rtekind)
{
case RTE_FUNCTION:
sub_action->hasSubLinks =
checkExprHasSubLink(rte->funcexpr);
break;
default:
/* other RTE types don't contain bare expressions */
break;
}
if (sub_action->hasSubLinks)
break; /* no need to keep scanning rtable */
}
}
/*
* Each rule action's jointree should be the main parsetree's jointree
* plus that rule's jointree, but usually *without* the original rtindex