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Teach planner how to rearrange join order for some classes of OUTER JOIN.

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Per my recent proposal.  I ended up basing the implementation on the
existing mechanism for enforcing valid join orders of IN joins --- the
rules for valid outer-join orders are somewhat similar.
This commit is contained in:
Tom Lane
2005-12-20 02:30:36 +00:00
parent 1a6aaaa6c4
commit e3b9852728
23 changed files with 969 additions and 722 deletions
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3
src/include/nodes/nodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.178 2005/11/22 18:17:30 momjian Exp $
* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.179 2005/12/20 02:30:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -186,6 +186,7 @@ typedef enum NodeTag
T_PathKeyItem,
T_RestrictInfo,
T_InnerIndexscanInfo,
T_OuterJoinInfo,
T_InClauseInfo,
/*