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Implement SEMI and ANTI joins in the planner and executor. (Semijoins replace
the old JOIN_IN code, but antijoins are new functionality.) Teach the planner to convert appropriate EXISTS and NOT EXISTS subqueries into semi and anti joins respectively. Also, LEFT JOINs with suitable upper-level IS NULL filters are recognized as being anti joins. Unify the InClauseInfo and OuterJoinInfo infrastructure into "SpecialJoinInfo". With that change, it becomes possible to associate a SpecialJoinInfo with every join attempt, which permits some cleanup of join selectivity estimation. That needs to be taken much further than this patch does, but the next step is to change the API for oprjoin selectivity functions, which seems like material for a separate patch. So for the moment the output size estimates for semi and especially anti joins are quite bogus.
This commit is contained in:
Tom Lane
@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.91 2008/08/02 21:32:01 tgl Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/clauses.h,v 1.92 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -59,6 +59,9 @@ extern bool contain_mutable_functions(Node *clause);
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extern bool contain_volatile_functions(Node *clause);
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extern bool contain_nonstrict_functions(Node *clause);
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extern Relids find_nonnullable_rels(Node *clause);
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extern List *find_nonnullable_vars(Node *clause);
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extern List *find_forced_null_vars(Node *clause);
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extern Var *find_forced_null_var(Node *clause);
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extern bool is_pseudo_constant_clause(Node *clause);
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extern bool is_pseudo_constant_clause_relids(Node *clause, Relids relids);
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.90 2008/01/01 19:45:58 momjian Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.91 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -87,9 +87,12 @@ extern void cost_group(Path *path, PlannerInfo *root,
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int numGroupCols, double numGroups,
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Cost input_startup_cost, Cost input_total_cost,
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double input_tuples);
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extern void cost_nestloop(NestPath *path, PlannerInfo *root);
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extern void cost_mergejoin(MergePath *path, PlannerInfo *root);
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extern void cost_hashjoin(HashPath *path, PlannerInfo *root);
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extern void cost_nestloop(NestPath *path, PlannerInfo *root,
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SpecialJoinInfo *sjinfo);
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extern void cost_mergejoin(MergePath *path, PlannerInfo *root,
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SpecialJoinInfo *sjinfo);
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extern void cost_hashjoin(HashPath *path, PlannerInfo *root,
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SpecialJoinInfo *sjinfo);
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extern void cost_qual_eval(QualCost *cost, List *quals, PlannerInfo *root);
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extern void cost_qual_eval_node(QualCost *cost, Node *qual, PlannerInfo *root);
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extern Cost get_initplan_cost(PlannerInfo *root, SubPlan *subplan);
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@@ -97,7 +100,7 @@ extern void set_baserel_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern void set_joinrel_size_estimates(PlannerInfo *root, RelOptInfo *rel,
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RelOptInfo *outer_rel,
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RelOptInfo *inner_rel,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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List *restrictlist);
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extern void set_function_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern void set_values_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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@@ -109,10 +112,12 @@ extern void set_values_size_estimates(PlannerInfo *root, RelOptInfo *rel);
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extern Selectivity clauselist_selectivity(PlannerInfo *root,
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List *clauses,
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int varRelid,
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JoinType jointype);
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JoinType jointype,
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SpecialJoinInfo *sjinfo);
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extern Selectivity clause_selectivity(PlannerInfo *root,
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Node *clause,
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int varRelid,
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JoinType jointype);
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JoinType jointype,
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SpecialJoinInfo *sjinfo);
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#endif /* COST_H */
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/pathnode.h,v 1.77 2008/01/01 19:45:58 momjian Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/pathnode.h,v 1.78 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -50,7 +50,7 @@ extern AppendPath *create_append_path(RelOptInfo *rel, List *subpaths);
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extern ResultPath *create_result_path(List *quals);
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extern MaterialPath *create_material_path(RelOptInfo *rel, Path *subpath);
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extern UniquePath *create_unique_path(PlannerInfo *root, RelOptInfo *rel,
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Path *subpath);
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Path *subpath, SpecialJoinInfo *sjinfo);
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extern Path *create_subqueryscan_path(RelOptInfo *rel, List *pathkeys);
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extern Path *create_functionscan_path(PlannerInfo *root, RelOptInfo *rel);
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extern Path *create_valuesscan_path(PlannerInfo *root, RelOptInfo *rel);
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@@ -58,6 +58,7 @@ extern Path *create_valuesscan_path(PlannerInfo *root, RelOptInfo *rel);
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extern NestPath *create_nestloop_path(PlannerInfo *root,
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RelOptInfo *joinrel,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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Path *outer_path,
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Path *inner_path,
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List *restrict_clauses,
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@@ -66,6 +67,7 @@ extern NestPath *create_nestloop_path(PlannerInfo *root,
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extern MergePath *create_mergejoin_path(PlannerInfo *root,
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RelOptInfo *joinrel,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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Path *outer_path,
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Path *inner_path,
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List *restrict_clauses,
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@@ -77,6 +79,7 @@ extern MergePath *create_mergejoin_path(PlannerInfo *root,
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extern HashPath *create_hashjoin_path(PlannerInfo *root,
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RelOptInfo *joinrel,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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Path *outer_path,
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Path *inner_path,
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List *restrict_clauses,
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@@ -93,7 +96,7 @@ extern RelOptInfo *build_join_rel(PlannerInfo *root,
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Relids joinrelids,
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RelOptInfo *outer_rel,
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RelOptInfo *inner_rel,
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JoinType jointype,
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SpecialJoinInfo *sjinfo,
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List **restrictlist_ptr);
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#endif /* PATHNODE_H */
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.104 2008/03/31 16:59:26 tgl Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.105 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -89,9 +89,8 @@ extern void create_tidscan_paths(PlannerInfo *root, RelOptInfo *rel);
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* routines to create join paths
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*/
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extern void add_paths_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
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RelOptInfo *outerrel,
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RelOptInfo *innerrel,
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JoinType jointype,
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RelOptInfo *outerrel, RelOptInfo *innerrel,
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JoinType jointype, SpecialJoinInfo *sjinfo,
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List *restrictlist);
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/*
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.110 2008/08/07 19:35:02 tgl Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/planmain.h,v 1.111 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -76,7 +76,6 @@ extern int join_collapse_limit;
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extern void add_base_rels_to_query(PlannerInfo *root, Node *jtnode);
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extern void build_base_rel_tlists(PlannerInfo *root, List *final_tlist);
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extern void add_IN_vars_to_tlists(PlannerInfo *root);
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extern void add_vars_to_targetlist(PlannerInfo *root, List *vars,
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Relids where_needed);
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extern List *deconstruct_jointree(PlannerInfo *root);
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.60 2008/03/18 22:04:14 tgl Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.61 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -21,7 +21,7 @@
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/*
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* prototypes for prepjointree.c
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*/
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extern Node *pull_up_IN_clauses(PlannerInfo *root, Node *node);
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extern Node *pull_up_sublinks(PlannerInfo *root, Node *node);
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extern void inline_set_returning_functions(PlannerInfo *root);
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extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode,
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bool below_outer_join, bool append_rel_member);
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@@ -5,7 +5,7 @@
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.31 2008/07/10 02:14:03 tgl Exp $
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* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.32 2008/08/14 18:48:00 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -15,7 +15,9 @@
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#include "nodes/plannodes.h"
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#include "nodes/relation.h"
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extern Node *convert_IN_to_join(PlannerInfo *root, SubLink *sublink);
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extern Node *convert_ANY_sublink_to_join(PlannerInfo *root, SubLink *sublink);
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extern Node *convert_EXISTS_sublink_to_join(PlannerInfo *root,
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SubLink *sublink, bool under_not);
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extern Node *SS_replace_correlation_vars(PlannerInfo *root, Node *expr);
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extern Node *SS_process_sublinks(PlannerInfo *root, Node *expr, bool isQual);
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extern void SS_finalize_plan(PlannerInfo *root, Plan *plan,
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