mirror of
https://git.postgresql.org/git/postgresql.git
synced 2026-02-05 16:27:35 +08:00
f41803bb39
representation of equivalence classes of variables. This is an extensive rewrite, but it brings a number of benefits: * planner no longer fails in the presence of "incomplete" operator families that don't offer operators for every possible combination of datatypes. * avoid generating and then discarding redundant equality clauses. * remove bogus assumption that derived equalities always use operators named "=". * mergejoins can work with a variety of sort orders (e.g., descending) now, instead of tying each mergejoinable operator to exactly one sort order. * better recognition of redundant sort columns. * can make use of equalities appearing underneath an outer join.
100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* pathnode.h
|
|
* prototypes for pathnode.c, relnode.c.
|
|
*
|
|
*
|
|
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
* $PostgreSQL: pgsql/src/include/optimizer/pathnode.h,v 1.76 2007/01/20 20:45:40 tgl Exp $
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef PATHNODE_H
|
|
#define PATHNODE_H
|
|
|
|
#include "nodes/relation.h"
|
|
|
|
|
|
/*
|
|
* prototypes for pathnode.c
|
|
*/
|
|
extern int compare_path_costs(Path *path1, Path *path2,
|
|
CostSelector criterion);
|
|
extern int compare_fractional_path_costs(Path *path1, Path *path2,
|
|
double fraction);
|
|
extern void set_cheapest(RelOptInfo *parent_rel);
|
|
extern void add_path(RelOptInfo *parent_rel, Path *new_path);
|
|
|
|
extern Path *create_seqscan_path(PlannerInfo *root, RelOptInfo *rel);
|
|
extern IndexPath *create_index_path(PlannerInfo *root,
|
|
IndexOptInfo *index,
|
|
List *clause_groups,
|
|
List *pathkeys,
|
|
ScanDirection indexscandir,
|
|
RelOptInfo *outer_rel);
|
|
extern BitmapHeapPath *create_bitmap_heap_path(PlannerInfo *root,
|
|
RelOptInfo *rel,
|
|
Path *bitmapqual,
|
|
RelOptInfo *outer_rel);
|
|
extern BitmapAndPath *create_bitmap_and_path(PlannerInfo *root,
|
|
RelOptInfo *rel,
|
|
List *bitmapquals);
|
|
extern BitmapOrPath *create_bitmap_or_path(PlannerInfo *root,
|
|
RelOptInfo *rel,
|
|
List *bitmapquals);
|
|
extern TidPath *create_tidscan_path(PlannerInfo *root, RelOptInfo *rel,
|
|
List *tidquals);
|
|
extern AppendPath *create_append_path(RelOptInfo *rel, List *subpaths);
|
|
extern ResultPath *create_result_path(List *quals);
|
|
extern MaterialPath *create_material_path(RelOptInfo *rel, Path *subpath);
|
|
extern UniquePath *create_unique_path(PlannerInfo *root, RelOptInfo *rel,
|
|
Path *subpath);
|
|
extern Path *create_subqueryscan_path(RelOptInfo *rel, List *pathkeys);
|
|
extern Path *create_functionscan_path(PlannerInfo *root, RelOptInfo *rel);
|
|
extern Path *create_valuesscan_path(PlannerInfo *root, RelOptInfo *rel);
|
|
|
|
extern NestPath *create_nestloop_path(PlannerInfo *root,
|
|
RelOptInfo *joinrel,
|
|
JoinType jointype,
|
|
Path *outer_path,
|
|
Path *inner_path,
|
|
List *restrict_clauses,
|
|
List *pathkeys);
|
|
|
|
extern MergePath *create_mergejoin_path(PlannerInfo *root,
|
|
RelOptInfo *joinrel,
|
|
JoinType jointype,
|
|
Path *outer_path,
|
|
Path *inner_path,
|
|
List *restrict_clauses,
|
|
List *pathkeys,
|
|
List *mergeclauses,
|
|
List *outersortkeys,
|
|
List *innersortkeys);
|
|
|
|
extern HashPath *create_hashjoin_path(PlannerInfo *root,
|
|
RelOptInfo *joinrel,
|
|
JoinType jointype,
|
|
Path *outer_path,
|
|
Path *inner_path,
|
|
List *restrict_clauses,
|
|
List *hashclauses);
|
|
|
|
/*
|
|
* prototypes for relnode.c
|
|
*/
|
|
extern RelOptInfo *build_simple_rel(PlannerInfo *root, int relid,
|
|
RelOptKind reloptkind);
|
|
extern RelOptInfo *find_base_rel(PlannerInfo *root, int relid);
|
|
extern RelOptInfo *find_join_rel(PlannerInfo *root, Relids relids);
|
|
extern RelOptInfo *build_join_rel(PlannerInfo *root,
|
|
Relids joinrelids,
|
|
RelOptInfo *outer_rel,
|
|
RelOptInfo *inner_rel,
|
|
JoinType jointype,
|
|
List **restrictlist_ptr);
|
|
|
|
#endif /* PATHNODE_H */
|