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77ba610805
This commit reverts137805f89as well as the associated commits015e88942,5306df283, and68d704edb. We found multiple bugs in this feature, and there was concern about possible planner slowdown (though to be fair, exhibiting a very large slowdown proved difficult). The way forward requires a considerable rewrite, which may or may not be possible to accomplish in time for beta2. In my judgment reviewing the rewrite will be easier to accomplish starting from a clean slate, so let's temporarily revert what's there now. This also leaves us in a safe state if it turns out to be necessary to postpone the rewrite to the next development cycle. Discussion: <20160429102531.GA13701@huehner.biz>
218 lines
7.7 KiB
C
218 lines
7.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* paths.h
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* prototypes for various files in optimizer/path
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*
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*
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* Portions Copyright (c) 1996-2016, 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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* src/include/optimizer/paths.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PATHS_H
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#define PATHS_H
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#include "nodes/relation.h"
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/*
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* allpaths.c
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*/
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extern bool enable_geqo;
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extern int geqo_threshold;
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/* Hook for plugins to get control in set_rel_pathlist() */
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typedef void (*set_rel_pathlist_hook_type) (PlannerInfo *root,
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RelOptInfo *rel,
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Index rti,
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RangeTblEntry *rte);
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extern PGDLLIMPORT set_rel_pathlist_hook_type set_rel_pathlist_hook;
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/* Hook for plugins to get control in add_paths_to_joinrel() */
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typedef void (*set_join_pathlist_hook_type) (PlannerInfo *root,
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RelOptInfo *joinrel,
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RelOptInfo *outerrel,
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RelOptInfo *innerrel,
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JoinType jointype,
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JoinPathExtraData *extra);
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extern PGDLLIMPORT set_join_pathlist_hook_type set_join_pathlist_hook;
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/* Hook for plugins to replace standard_join_search() */
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typedef RelOptInfo *(*join_search_hook_type) (PlannerInfo *root,
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int levels_needed,
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List *initial_rels);
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extern PGDLLIMPORT join_search_hook_type join_search_hook;
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extern RelOptInfo *make_one_rel(PlannerInfo *root, List *joinlist);
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extern void set_dummy_rel_pathlist(RelOptInfo *rel);
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extern RelOptInfo *standard_join_search(PlannerInfo *root, int levels_needed,
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List *initial_rels);
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extern void generate_gather_paths(PlannerInfo *root, RelOptInfo *rel);
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#ifdef OPTIMIZER_DEBUG
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extern void debug_print_rel(PlannerInfo *root, RelOptInfo *rel);
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#endif
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/*
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* indxpath.c
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* routines to generate index paths
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*/
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extern void create_index_paths(PlannerInfo *root, RelOptInfo *rel);
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extern bool relation_has_unique_index_for(PlannerInfo *root, RelOptInfo *rel,
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List *restrictlist,
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List *exprlist, List *oprlist);
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extern bool match_index_to_operand(Node *operand, int indexcol,
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IndexOptInfo *index);
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extern void expand_indexqual_conditions(IndexOptInfo *index,
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List *indexclauses, List *indexclausecols,
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List **indexquals_p, List **indexqualcols_p);
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extern void check_index_predicates(PlannerInfo *root, RelOptInfo *rel);
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extern Expr *adjust_rowcompare_for_index(RowCompareExpr *clause,
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IndexOptInfo *index,
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int indexcol,
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List **indexcolnos,
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bool *var_on_left_p);
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/*
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* tidpath.h
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* routines to generate tid paths
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*/
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extern void create_tidscan_paths(PlannerInfo *root, RelOptInfo *rel);
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/*
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* joinpath.c
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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, RelOptInfo *innerrel,
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JoinType jointype, SpecialJoinInfo *sjinfo,
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List *restrictlist);
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/*
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* joinrels.c
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* routines to determine which relations to join
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*/
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extern void join_search_one_level(PlannerInfo *root, int level);
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extern RelOptInfo *make_join_rel(PlannerInfo *root,
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RelOptInfo *rel1, RelOptInfo *rel2);
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extern bool have_join_order_restriction(PlannerInfo *root,
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RelOptInfo *rel1, RelOptInfo *rel2);
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extern bool have_dangerous_phv(PlannerInfo *root,
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Relids outer_relids, Relids inner_params);
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/*
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* equivclass.c
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* routines for managing EquivalenceClasses
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*/
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typedef bool (*ec_matches_callback_type) (PlannerInfo *root,
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RelOptInfo *rel,
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EquivalenceClass *ec,
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EquivalenceMember *em,
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void *arg);
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extern bool process_equivalence(PlannerInfo *root, RestrictInfo *restrictinfo,
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bool below_outer_join);
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extern Expr *canonicalize_ec_expression(Expr *expr,
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Oid req_type, Oid req_collation);
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extern void reconsider_outer_join_clauses(PlannerInfo *root);
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extern EquivalenceClass *get_eclass_for_sort_expr(PlannerInfo *root,
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Expr *expr,
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Relids nullable_relids,
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List *opfamilies,
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Oid opcintype,
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Oid collation,
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Index sortref,
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Relids rel,
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bool create_it);
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extern void generate_base_implied_equalities(PlannerInfo *root);
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extern List *generate_join_implied_equalities(PlannerInfo *root,
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Relids join_relids,
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Relids outer_relids,
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RelOptInfo *inner_rel);
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extern List *generate_join_implied_equalities_for_ecs(PlannerInfo *root,
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List *eclasses,
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Relids join_relids,
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Relids outer_relids,
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RelOptInfo *inner_rel);
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extern bool exprs_known_equal(PlannerInfo *root, Node *item1, Node *item2);
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extern void add_child_rel_equivalences(PlannerInfo *root,
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AppendRelInfo *appinfo,
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RelOptInfo *parent_rel,
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RelOptInfo *child_rel);
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extern List *generate_implied_equalities_for_column(PlannerInfo *root,
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RelOptInfo *rel,
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ec_matches_callback_type callback,
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void *callback_arg,
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Relids prohibited_rels);
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extern bool have_relevant_eclass_joinclause(PlannerInfo *root,
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RelOptInfo *rel1, RelOptInfo *rel2);
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extern bool has_relevant_eclass_joinclause(PlannerInfo *root,
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RelOptInfo *rel1);
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extern bool eclass_useful_for_merging(PlannerInfo *root,
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EquivalenceClass *eclass,
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RelOptInfo *rel);
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extern bool is_redundant_derived_clause(RestrictInfo *rinfo, List *clauselist);
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/*
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* pathkeys.c
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* utilities for matching and building path keys
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*/
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typedef enum
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{
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PATHKEYS_EQUAL, /* pathkeys are identical */
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PATHKEYS_BETTER1, /* pathkey 1 is a superset of pathkey 2 */
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PATHKEYS_BETTER2, /* vice versa */
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PATHKEYS_DIFFERENT /* neither pathkey includes the other */
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} PathKeysComparison;
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extern PathKeysComparison compare_pathkeys(List *keys1, List *keys2);
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extern bool pathkeys_contained_in(List *keys1, List *keys2);
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extern Path *get_cheapest_path_for_pathkeys(List *paths, List *pathkeys,
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Relids required_outer,
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CostSelector cost_criterion);
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extern Path *get_cheapest_fractional_path_for_pathkeys(List *paths,
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List *pathkeys,
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Relids required_outer,
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double fraction);
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extern List *build_index_pathkeys(PlannerInfo *root, IndexOptInfo *index,
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ScanDirection scandir);
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extern List *build_expression_pathkey(PlannerInfo *root, Expr *expr,
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Relids nullable_relids, Oid opno,
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Relids rel, bool create_it);
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extern List *convert_subquery_pathkeys(PlannerInfo *root, RelOptInfo *rel,
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List *subquery_pathkeys,
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List *subquery_tlist);
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extern List *build_join_pathkeys(PlannerInfo *root,
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RelOptInfo *joinrel,
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JoinType jointype,
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List *outer_pathkeys);
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extern List *make_pathkeys_for_sortclauses(PlannerInfo *root,
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List *sortclauses,
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List *tlist);
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extern void initialize_mergeclause_eclasses(PlannerInfo *root,
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RestrictInfo *restrictinfo);
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extern void update_mergeclause_eclasses(PlannerInfo *root,
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RestrictInfo *restrictinfo);
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extern List *find_mergeclauses_for_pathkeys(PlannerInfo *root,
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List *pathkeys,
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bool outer_keys,
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List *restrictinfos);
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extern List *select_outer_pathkeys_for_merge(PlannerInfo *root,
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List *mergeclauses,
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RelOptInfo *joinrel);
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extern List *make_inner_pathkeys_for_merge(PlannerInfo *root,
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List *mergeclauses,
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List *outer_pathkeys);
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extern List *truncate_useless_pathkeys(PlannerInfo *root,
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RelOptInfo *rel,
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List *pathkeys);
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extern bool has_useful_pathkeys(PlannerInfo *root, RelOptInfo *rel);
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extern PathKey *make_canonical_pathkey(PlannerInfo *root,
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EquivalenceClass *eclass, Oid opfamily,
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int strategy, bool nulls_first);
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#endif /* PATHS_H */
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