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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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4
src/include/optimizer/pathnode.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/pathnode.h,v 1.83 2010/02/26 02:01:26 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/pathnode.h,v 1.84 2010/03/28 22:59:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -51,8 +51,6 @@ extern ResultPath *create_result_path(List *quals);
extern MaterialPath *create_material_path(RelOptInfo *rel, Path *subpath);
extern UniquePath *create_unique_path(PlannerInfo *root, RelOptInfo *rel,
Path *subpath, SpecialJoinInfo *sjinfo);
extern NoOpPath *create_noop_path(PlannerInfo *root, RelOptInfo *rel,
Path *subpath);
extern Path *create_subqueryscan_path(RelOptInfo *rel, List *pathkeys);
extern Path *create_functionscan_path(PlannerInfo *root, RelOptInfo *rel);
extern Path *create_valuesscan_path(PlannerInfo *root, RelOptInfo *rel);

3
src/include/optimizer/placeholder.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/placeholder.h,v 1.4 2010/01/02 16:58:07 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/placeholder.h,v 1.5 2010/03/28 22:59:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -22,6 +22,7 @@ extern PlaceHolderVar *make_placeholder_expr(PlannerInfo *root, Expr *expr,
extern PlaceHolderInfo *find_placeholder_info(PlannerInfo *root,
PlaceHolderVar *phv);
extern void fix_placeholder_eval_levels(PlannerInfo *root);
extern void add_placeholders_to_base_rels(PlannerInfo *root);
extern void add_placeholders_to_joinrel(PlannerInfo *root,
RelOptInfo *joinrel);

7
src/include/optimizer/planmain.h
View File

@@ -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
*/