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Rework join-removal logic as per recent discussion. In particular this

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fixes things so that it works for cases where nested removals are possible.
The overhead of the optimization should be significantly less, as well.
This commit is contained in:
Tom Lane
2010-03-28 22:59:34 +00:00
parent a760893dbd
commit b78f6264eb
17 changed files with 585 additions and 317 deletions
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7
src/include/optimizer/planmain.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/optimizer/planmain.h,v 1.126 2010/02/26 02:01:26 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.127 2010/03/28 22:59:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -108,6 +108,11 @@ extern RestrictInfo *build_implied_join_equality(Oid opno,
Expr *item2,
Relids qualscope);
/*
* prototypes for plan/analyzejoins.c
*/
extern List *remove_useless_joins(PlannerInfo *root, List *joinlist);
/*
* prototypes for plan/setrefs.c
*/