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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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9
src/include/optimizer/paths.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/optimizer/paths.h,v 1.89 2005/11/25 19:47:50 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.90 2005/12/20 02:30:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,8 +23,7 @@
extern bool enable_geqo;
extern int geqo_threshold;
extern RelOptInfo *make_one_rel(PlannerInfo *root);
extern RelOptInfo *make_fromexpr_rel(PlannerInfo *root, FromExpr *from);
extern RelOptInfo *make_one_rel(PlannerInfo *root, List *joinlist);
#ifdef OPTIMIZER_DEBUG
extern void debug_print_rel(PlannerInfo *root, RelOptInfo *rel);
@@ -88,10 +87,8 @@ extern void add_paths_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
* routines to determine which relations to join
*/
extern List *make_rels_by_joins(PlannerInfo *root, int level, List **joinrels);
extern RelOptInfo *make_jointree_rel(PlannerInfo *root, Node *jtnode);
extern RelOptInfo *make_join_rel(PlannerInfo *root,
RelOptInfo *rel1, RelOptInfo *rel2,
JoinType jointype);
RelOptInfo *rel1, RelOptInfo *rel2);
/*
* pathkeys.c