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Remove prohibition against SubLinks in the WHERE clause of an EXISTS subquery

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that we're considering pulling up.  I hadn't wanted to think through whether
that could work during the first pass at this stuff.  However, on closer
inspection it seems to be safe enough.
This commit is contained in:
Tom Lane 2008-08-17 02:19:19 +00:00
parent 19e34b6239
commit f2689e421d
1 changed files with 1 additions and 9 deletions
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10
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 1.134 2008/08/17 01:20:00 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.135 2008/08/17 02:19:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -969,14 +969,6 @@ convert_EXISTS_sublink_to_join(PlannerInfo *root, SubLink *sublink,
if (contain_volatile_functions(whereClause))
return false;
/*
* Also disallow SubLinks within the WHERE clause. (XXX this could
* probably be supported, but it would complicate the transformation
* below, and it doesn't seem worth worrying about in a first pass.)
*/
if (contain_subplans(whereClause))
return false;
/*
* Prepare to pull up the sub-select into top range table.
*