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Add support for doing FULL JOIN ON FALSE. While this is really a rather

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peculiar variant of UNION ALL, and so wouldn't likely get written directly
as-is, it's possible for it to arise as a result of simplification of
less-obviously-silly queries.  In particular, now that we can do flattening
of subqueries that have constant outputs and are underneath an outer join,
it's possible for the case to result from simplification of queries of the
type exhibited in bug #5263.  Back-patch to 8.4 to avoid a functionality
regression for this type of query.
This commit is contained in:
Tom Lane
2010-01-05 23:25:36 +00:00
parent d86d51a958
commit 90f4c2d960
5 changed files with 116 additions and 13 deletions
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4
src/include/nodes/execnodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.216 2010/01/02 16:58:04 momjian Exp $
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.217 2010/01/05 23:25:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1396,6 +1396,7 @@ typedef struct NestLoopState
* Clauses info for each mergejoinable clause
* JoinState current "state" of join. see execdefs.h
* ExtraMarks true to issue extra Mark operations on inner scan
* ConstFalseJoin true if we have a constant-false joinqual
* FillOuter true if should emit unjoined outer tuples anyway
* FillInner true if should emit unjoined inner tuples anyway
* MatchedOuter true if found a join match for current outer tuple
@@ -1419,6 +1420,7 @@ typedef struct MergeJoinState
MergeJoinClause mj_Clauses; /* array of length mj_NumClauses */
int mj_JoinState;
bool mj_ExtraMarks;
bool mj_ConstFalseJoin;
bool mj_FillOuter;
bool mj_FillInner;
bool mj_MatchedOuter;