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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/optimizer/clauses.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/clauses.h,v 1.80 2005/10/15 02:49:45 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.81 2005/12/20 02:30:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -57,6 +57,7 @@ extern bool contain_subplans(Node *clause);
extern bool contain_mutable_functions(Node *clause);
extern bool contain_volatile_functions(Node *clause);
extern bool contain_nonstrict_functions(Node *clause);
extern Relids find_nonnullable_rels(Node *clause);
extern bool is_pseudo_constant_clause(Node *clause);
extern bool is_pseudo_constant_clause_relids(Node *clause, Relids relids);

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

8
src/include/optimizer/planmain.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/planmain.h,v 1.90 2005/10/15 02:49:45 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.91 2005/12/20 02:30:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -65,10 +65,12 @@ extern bool is_projection_capable_plan(Plan *plan);
/*
* prototypes for plan/initsplan.c
*/
extern int from_collapse_limit;
extern int join_collapse_limit;
extern void add_base_rels_to_query(PlannerInfo *root, Node *jtnode);
extern void build_base_rel_tlists(PlannerInfo *root, List *final_tlist);
extern Relids distribute_quals_to_rels(PlannerInfo *root, Node *jtnode,
bool below_outer_join);
extern List *deconstruct_jointree(PlannerInfo *root);
extern void process_implied_equality(PlannerInfo *root,
Node *item1, Node *item2,
Oid sortop1, Oid sortop2,

6
src/include/optimizer/prep.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/prep.h,v 1.52 2005/10/15 02:49:45 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.53 2005/12/20 02:30:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,14 +21,10 @@
/*
* prototypes for prepjointree.c
*/
extern int from_collapse_limit;
extern int join_collapse_limit;
extern Node *pull_up_IN_clauses(PlannerInfo *root, Node *node);
extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode,
bool below_outer_join);
extern void reduce_outer_joins(PlannerInfo *root);
extern Node *simplify_jointree(PlannerInfo *root, Node *jtnode);
extern Relids get_relids_in_jointree(Node *jtnode);
extern Relids get_relids_for_join(PlannerInfo *root, int joinrelid);