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Previous fix for "x FULL JOIN y ON true" failed to handle the case

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where there was also a WHERE-clause restriction that applied to the
join.  The check on restrictlist == NIL is really unnecessary anyway,
because select_mergejoin_clauses already checked for and complained
about any unmergejoinable join clauses.  So just take it out.
This commit is contained in:
Tom Lane 2005-05-24 18:02:31 +00:00
parent bc6444dc6a
commit 872c1497fc
1 changed files with 2 additions and 7 deletions
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9
src/backend/optimizer/path/joinpath.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/joinpath.c,v 1.93 2005/04/19 22:35:15 tgl Exp $ * $PostgreSQL: pgsql/src/backend/optimizer/path/joinpath.c,v 1.94 2005/05/24 18:02:31 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -499,15 +499,10 @@ match_unsorted_outer(Query *root,
* nestloop path, but since mergejoin is our only join type that * nestloop path, but since mergejoin is our only join type that
* supports FULL JOIN, it's necessary to generate a clauseless * supports FULL JOIN, it's necessary to generate a clauseless
* mergejoin path instead. * mergejoin path instead.
*
* Unfortunately this can't easily be extended to handle the case
* where there are joinclauses but none of them use mergejoinable
* operators; nodeMergejoin.c can only do a full join correctly if
* all the joinclauses are mergeclauses.
*/ */
if (mergeclauses == NIL) if (mergeclauses == NIL)
{ {
if (jointype == JOIN_FULL && restrictlist == NIL) if (jointype == JOIN_FULL)
/* okay to try for mergejoin */ ; /* okay to try for mergejoin */ ;
else else
continue; continue;