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Diffstat (limited to 'src/include/optimizer/paths.h')
| -rw-r--r-- | src/include/optimizer/paths.h | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h new file mode 100644 index 0000000..9254ee0 --- /dev/null +++ b/src/include/optimizer/paths.h @@ -0,0 +1,257 @@ +/*------------------------------------------------------------------------- + * + * paths.h + * prototypes for various files in optimizer/path + * + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/optimizer/paths.h + * + *------------------------------------------------------------------------- + */ +#ifndef PATHS_H +#define PATHS_H + +#include "nodes/pathnodes.h" + + +/* + * allpaths.c + */ +extern PGDLLIMPORT bool enable_geqo; +extern PGDLLIMPORT int geqo_threshold; +extern PGDLLIMPORT int min_parallel_table_scan_size; +extern PGDLLIMPORT int min_parallel_index_scan_size; + +/* Hook for plugins to get control in set_rel_pathlist() */ +typedef void (*set_rel_pathlist_hook_type) (PlannerInfo *root, + RelOptInfo *rel, + Index rti, + RangeTblEntry *rte); +extern PGDLLIMPORT set_rel_pathlist_hook_type set_rel_pathlist_hook; + +/* Hook for plugins to get control in add_paths_to_joinrel() */ +typedef void (*set_join_pathlist_hook_type) (PlannerInfo *root, + RelOptInfo *joinrel, + RelOptInfo *outerrel, + RelOptInfo *innerrel, + JoinType jointype, + JoinPathExtraData *extra); +extern PGDLLIMPORT set_join_pathlist_hook_type set_join_pathlist_hook; + +/* Hook for plugins to replace standard_join_search() */ +typedef RelOptInfo *(*join_search_hook_type) (PlannerInfo *root, + int levels_needed, + List *initial_rels); +extern PGDLLIMPORT join_search_hook_type join_search_hook; + + +extern RelOptInfo *make_one_rel(PlannerInfo *root, List *joinlist); +extern RelOptInfo *standard_join_search(PlannerInfo *root, int levels_needed, + List *initial_rels); + +extern void generate_gather_paths(PlannerInfo *root, RelOptInfo *rel, + bool override_rows); +extern void generate_useful_gather_paths(PlannerInfo *root, RelOptInfo *rel, + bool override_rows); +extern int compute_parallel_worker(RelOptInfo *rel, double heap_pages, + double index_pages, int max_workers); +extern void create_partial_bitmap_paths(PlannerInfo *root, RelOptInfo *rel, + Path *bitmapqual); +extern void generate_partitionwise_join_paths(PlannerInfo *root, + RelOptInfo *rel); + +#ifdef OPTIMIZER_DEBUG +extern void debug_print_rel(PlannerInfo *root, RelOptInfo *rel); +#endif + +/* + * indxpath.c + * routines to generate index paths + */ +extern void create_index_paths(PlannerInfo *root, RelOptInfo *rel); +extern bool relation_has_unique_index_for(PlannerInfo *root, RelOptInfo *rel, + List *restrictlist, + List *exprlist, List *oprlist); +extern bool indexcol_is_bool_constant_for_query(PlannerInfo *root, + IndexOptInfo *index, + int indexcol); +extern bool match_index_to_operand(Node *operand, int indexcol, + IndexOptInfo *index); +extern void check_index_predicates(PlannerInfo *root, RelOptInfo *rel); + +/* + * tidpath.h + * routines to generate tid paths + */ +extern void create_tidscan_paths(PlannerInfo *root, RelOptInfo *rel); + +/* + * joinpath.c + * routines to create join paths + */ +extern void add_paths_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel, + RelOptInfo *outerrel, RelOptInfo *innerrel, + JoinType jointype, SpecialJoinInfo *sjinfo, + List *restrictlist); + +/* + * joinrels.c + * routines to determine which relations to join + */ +extern void join_search_one_level(PlannerInfo *root, int level); +extern RelOptInfo *make_join_rel(PlannerInfo *root, + RelOptInfo *rel1, RelOptInfo *rel2); +extern bool have_join_order_restriction(PlannerInfo *root, + RelOptInfo *rel1, RelOptInfo *rel2); +extern bool have_dangerous_phv(PlannerInfo *root, + Relids outer_relids, Relids inner_params); +extern void mark_dummy_rel(RelOptInfo *rel); + +/* + * equivclass.c + * routines for managing EquivalenceClasses + */ +typedef bool (*ec_matches_callback_type) (PlannerInfo *root, + RelOptInfo *rel, + EquivalenceClass *ec, + EquivalenceMember *em, + void *arg); + +extern bool process_equivalence(PlannerInfo *root, + RestrictInfo **p_restrictinfo, + bool below_outer_join); +extern Expr *canonicalize_ec_expression(Expr *expr, + Oid req_type, Oid req_collation); +extern void reconsider_outer_join_clauses(PlannerInfo *root); +extern EquivalenceClass *get_eclass_for_sort_expr(PlannerInfo *root, + Expr *expr, + Relids nullable_relids, + List *opfamilies, + Oid opcintype, + Oid collation, + Index sortref, + Relids rel, + bool create_it); +extern EquivalenceMember *find_ec_member_matching_expr(EquivalenceClass *ec, + Expr *expr, + Relids relids); +extern EquivalenceMember *find_computable_ec_member(PlannerInfo *root, + EquivalenceClass *ec, + List *exprs, + Relids relids, + bool require_parallel_safe); +extern Expr *find_em_expr_for_rel(EquivalenceClass *ec, RelOptInfo *rel); +extern Expr *find_em_expr_usable_for_sorting_rel(PlannerInfo *root, + EquivalenceClass *ec, + RelOptInfo *rel, + bool require_parallel_safe); +extern void generate_base_implied_equalities(PlannerInfo *root); +extern List *generate_join_implied_equalities(PlannerInfo *root, + Relids join_relids, + Relids outer_relids, + RelOptInfo *inner_rel); +extern List *generate_join_implied_equalities_for_ecs(PlannerInfo *root, + List *eclasses, + Relids join_relids, + Relids outer_relids, + RelOptInfo *inner_rel); +extern bool exprs_known_equal(PlannerInfo *root, Node *item1, Node *item2); +extern EquivalenceClass *match_eclasses_to_foreign_key_col(PlannerInfo *root, + ForeignKeyOptInfo *fkinfo, + int colno); +extern void add_child_rel_equivalences(PlannerInfo *root, + AppendRelInfo *appinfo, + RelOptInfo *parent_rel, + RelOptInfo *child_rel); +extern void add_child_join_rel_equivalences(PlannerInfo *root, + int nappinfos, + AppendRelInfo **appinfos, + RelOptInfo *parent_rel, + RelOptInfo *child_rel); +extern List *generate_implied_equalities_for_column(PlannerInfo *root, + RelOptInfo *rel, + ec_matches_callback_type callback, + void *callback_arg, + Relids prohibited_rels); +extern bool have_relevant_eclass_joinclause(PlannerInfo *root, + RelOptInfo *rel1, RelOptInfo *rel2); +extern bool has_relevant_eclass_joinclause(PlannerInfo *root, + RelOptInfo *rel1); +extern bool eclass_useful_for_merging(PlannerInfo *root, + EquivalenceClass *eclass, + RelOptInfo *rel); +extern bool is_redundant_derived_clause(RestrictInfo *rinfo, List *clauselist); +extern bool is_redundant_with_indexclauses(RestrictInfo *rinfo, + List *indexclauses); + +/* + * pathkeys.c + * utilities for matching and building path keys + */ +typedef enum +{ + PATHKEYS_EQUAL, /* pathkeys are identical */ + PATHKEYS_BETTER1, /* pathkey 1 is a superset of pathkey 2 */ + PATHKEYS_BETTER2, /* vice versa */ + PATHKEYS_DIFFERENT /* neither pathkey includes the other */ +} PathKeysComparison; + +extern PathKeysComparison compare_pathkeys(List *keys1, List *keys2); +extern bool pathkeys_contained_in(List *keys1, List *keys2); +extern bool pathkeys_count_contained_in(List *keys1, List *keys2, int *n_common); +extern Path *get_cheapest_path_for_pathkeys(List *paths, List *pathkeys, + Relids required_outer, + CostSelector cost_criterion, + bool require_parallel_safe); +extern Path *get_cheapest_fractional_path_for_pathkeys(List *paths, + List *pathkeys, + Relids required_outer, + double fraction); +extern Path *get_cheapest_parallel_safe_total_inner(List *paths); +extern List *build_index_pathkeys(PlannerInfo *root, IndexOptInfo *index, + ScanDirection scandir); +extern List *build_partition_pathkeys(PlannerInfo *root, RelOptInfo *partrel, + ScanDirection scandir, bool *partialkeys); +extern List *build_expression_pathkey(PlannerInfo *root, Expr *expr, + Relids nullable_relids, Oid opno, + Relids rel, bool create_it); +extern List *convert_subquery_pathkeys(PlannerInfo *root, RelOptInfo *rel, + List *subquery_pathkeys, + List *subquery_tlist); +extern List *build_join_pathkeys(PlannerInfo *root, + RelOptInfo *joinrel, + JoinType jointype, + List *outer_pathkeys); +extern List *make_pathkeys_for_sortclauses(PlannerInfo *root, + List *sortclauses, + List *tlist); +extern void initialize_mergeclause_eclasses(PlannerInfo *root, + RestrictInfo *restrictinfo); +extern void update_mergeclause_eclasses(PlannerInfo *root, + RestrictInfo *restrictinfo); +extern List *find_mergeclauses_for_outer_pathkeys(PlannerInfo *root, + List *pathkeys, + List *restrictinfos); +extern List *select_outer_pathkeys_for_merge(PlannerInfo *root, + List *mergeclauses, + RelOptInfo *joinrel); +extern List *make_inner_pathkeys_for_merge(PlannerInfo *root, + List *mergeclauses, + List *outer_pathkeys); +extern List *trim_mergeclauses_for_inner_pathkeys(PlannerInfo *root, + List *mergeclauses, + List *pathkeys); +extern List *truncate_useless_pathkeys(PlannerInfo *root, + RelOptInfo *rel, + List *pathkeys); +extern bool has_useful_pathkeys(PlannerInfo *root, RelOptInfo *rel); +extern PathKey *make_canonical_pathkey(PlannerInfo *root, + EquivalenceClass *eclass, Oid opfamily, + int strategy, bool nulls_first); +extern void add_paths_to_append_rel(PlannerInfo *root, RelOptInfo *rel, + List *live_childrels); + +#endif /* PATHS_H */ |