postgresql/src/include/optimizer/paths.h

/*-------------------------------------------------------------------------
 *
 * paths.h
 *	  prototypes for various files in optimizer/paths (were separate
 *	  header files
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: paths.h,v 1.16 1999/02/14 04:56:55 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PATHS_H
#define PATHS_H

#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/relation.h"

/*
 * allpaths.h
 */
extern List *find_paths(Query *root, List *rels);

/*
 * indxpath.h
 *	  routines to generate index paths
 */
extern List *find_index_paths(Query *root, RelOptInfo *rel, List *indices,
				 List *restrictinfo_list,
				 List *joininfo_list);

/*
 * joinpath.h
 *	   routines to create join paths
 */
extern void update_rels_pathlist_for_joins(Query *root, List *joinrels);


/*
 * orindxpath.h
 */
extern List *create_or_index_paths(Query *root, RelOptInfo *rel, List *clauses);

/*
 * hashutils.h
 *	  routines to deal with hash keys and clauses
 */
extern List *group_clauses_by_hashop(List *restrictinfo_list,
						int inner_relid);

/*
 * joinutils.h
 *	  generic join method key/clause routines
 */
extern List *match_pathkeys_joinkeys(List *pathkeys,
					 List *joinkeys, List *joinclauses, int which_subkey,
						List **matchedJoinClausesPtr);
extern List *extract_path_keys(List *joinkeys, List *tlist,
				  int which_subkey);
extern Path *match_paths_joinkeys(List *joinkeys, PathOrder *ordering,
					 List *paths, int which_subkey);
extern List *new_join_pathkeys(List *outer_pathkeys,
				  List *join_rel_tlist, List *joinclauses);

/*
 * mergeutils.h
 *	  routines to deal with merge keys and clauses
 */
extern List *group_clauses_by_order(List *restrictinfo_list,
					   int inner_relid);
extern MergeInfo *match_order_mergeinfo(PathOrder *ordering,
					  List *mergeinfo_list);

/*
 * joinrels.h
 *	  routines to determine which relations to join
 */
extern List *make_new_rels_by_joins(Query *root, List *outer_rels);
extern void add_new_joininfos(Query *root, List *joinrels, List *outerrels);
extern List *final_join_rels(List *join_rel_list);

/*
 * prototypes for path/prune.c
 */
extern void merge_rels_with_same_relids(List *rel_list);
extern void rels_set_cheapest(List *rel_list);
extern List *merge_joinrels(List *rel_list1, List *rel_list2);
extern List *prune_oldrels(List *old_rels);

#endif	 /* PATHS_H */