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9f5f212475
necessarily following the JOIN syntax to develop the query plan. The old behavior is still available by setting GUC variable JOIN_COLLAPSE_LIMIT to 1. Also create a GUC variable FROM_COLLAPSE_LIMIT to control the similar decision about when to collapse sub-SELECT lists into their parent lists. (This behavior existed already, but the limit was always GEQO_THRESHOLD/2; now it's separately adjustable.)
129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* paths.h
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* prototypes for various files in optimizer/path (were separate
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* header files)
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*
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*
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* Portions Copyright (c) 1996-2002, 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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* $Id: paths.h,v 1.65 2003/01/25 23:10:30 tgl Exp $
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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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extern RelOptInfo *make_one_rel(Query *root);
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extern RelOptInfo *make_fromexpr_rel(Query *root, FromExpr *from);
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#ifdef OPTIMIZER_DEBUG
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extern void debug_print_rel(Query *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(Query *root, RelOptInfo *rel);
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extern Path *best_inner_indexscan(Query *root, RelOptInfo *rel,
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Relids outer_relids, JoinType jointype);
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extern List *extract_or_indexqual_conditions(RelOptInfo *rel,
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IndexOptInfo *index,
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Expr *orsubclause);
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extern List *expand_indexqual_conditions(List *indexquals);
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/*
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* orindxpath.c
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* additional routines for indexable OR clauses
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*/
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extern void create_or_index_paths(Query *root, RelOptInfo *rel);
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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(Query *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(Query *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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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 List *make_rels_by_joins(Query *root, int level, List **joinrels);
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extern RelOptInfo *make_jointree_rel(Query *root, Node *jtnode);
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extern RelOptInfo *make_join_rel(Query *root,
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RelOptInfo *rel1, RelOptInfo *rel2,
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JoinType jointype);
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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 void add_equijoined_keys(Query *root, RestrictInfo *restrictinfo);
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extern bool exprs_known_equal(Query *root, Node *item1, Node *item2);
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extern void generate_implied_equalities(Query *root);
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extern List *canonicalize_pathkeys(Query *root, List *pathkeys);
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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 PathKeysComparison compare_noncanonical_pathkeys(List *keys1,
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List *keys2);
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extern bool noncanonical_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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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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double fraction);
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extern List *build_index_pathkeys(Query *root, RelOptInfo *rel,
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IndexOptInfo *index,
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ScanDirection scandir);
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extern List *build_join_pathkeys(Query *root,
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RelOptInfo *joinrel,
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List *outer_pathkeys);
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extern List *make_pathkeys_for_sortclauses(List *sortclauses,
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List *tlist);
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extern void cache_mergeclause_pathkeys(Query *root,
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RestrictInfo *restrictinfo);
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extern List *find_mergeclauses_for_pathkeys(Query *root,
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List *pathkeys,
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List *restrictinfos);
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extern List *make_pathkeys_for_mergeclauses(Query *root,
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List *mergeclauses,
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RelOptInfo *rel);
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extern int pathkeys_useful_for_merging(Query *root,
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RelOptInfo *rel,
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List *pathkeys);
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extern int pathkeys_useful_for_ordering(Query *root, List *pathkeys);
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extern List *truncate_useless_pathkeys(Query *root,
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RelOptInfo *rel,
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List *pathkeys);
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#endif /* PATHS_H */
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