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Commita49147a

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Fix an oversight in convert_EXISTS_sublink_to_join: we can't convert an
EXISTS that contains a WITH clause. This would usually lead to a"could not find CTE" error later in planning, because the WITH wouldn'tget processed at all. Noted while playing with an example from Ken Marshall.
1 parenta0a7e63 commita49147a

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‎src/backend/optimizer/plan/subselect.c

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.157 2010/01/02 16:57:47 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.158 2010/01/18 18:17:45 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -1114,6 +1114,17 @@ convert_EXISTS_sublink_to_join(PlannerInfo *root, SubLink *sublink,
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Assert(sublink->subLinkType==EXISTS_SUBLINK);
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/*
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* Can't flatten if it contains WITH. (We could arrange to pull up the
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* WITH into the parent query's cteList, but that risks changing the
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* semantics, since a WITH ought to be executed once per associated query
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* call.) Note that convert_ANY_sublink_to_join doesn't have to reject
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* this case, since it just produces a subquery RTE that doesn't have to
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* get flattened into the parent query.
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*/
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if (subselect->cteList)
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returnNULL;
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/*
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* Copy the subquery so we can modify it safely (see comments in
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* make_subplan).

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