1 /*-------------------------------------------------------------------------
4 * prototypes for various files in optimizer/paths (were separate
8 * Copyright (c) 1994, Regents of the University of California
10 * $Id: paths.h,v 1.8 1998/02/26 04:42:17 momjian Exp $
12 *-------------------------------------------------------------------------
17 #include "nodes/nodes.h"
18 #include "nodes/parsenodes.h"
19 #include "nodes/relation.h"
24 extern List *find_paths(Query *root, List *rels);
28 * routines to generate index paths
31 find_index_paths(Query *root, Rel *rel, List *indices,
32 List *clauseinfo_list,
37 * routines to create join paths
39 extern void find_all_join_paths(Query *root, List *joinrels);
45 extern List *create_or_index_paths(Query *root, Rel *rel, List *clauses);
49 * routines to deal with hash keys and clauses
52 group_clauses_by_hashop(List *clauseinfo_list,
57 * generic join method key/clause routines
60 match_pathkeys_joinkeys(List *pathkeys,
61 List *joinkeys, List *joinclauses, int which_subkey,
62 List **matchedJoinClausesPtr);
64 extract_path_keys(List *joinkeys, List *tlist,
67 match_paths_joinkeys(List *joinkeys, PathOrder *ordering,
68 List *paths, int which_subkey);
70 new_join_pathkeys(List *outer_pathkeys,
71 List *join_rel_tlist, List *joinclauses);
75 * routines to deal with merge keys and clauses
78 group_clauses_by_order(List *clauseinfo_list,
81 match_order_mergeinfo(PathOrder *ordering,
82 List *mergeinfo_list);
86 * routines to determine which relations to join
88 extern List *find_join_rels(Query *root, List *outer_rels);
89 extern void add_new_joininfos(Query *root, List *joinrels, List *outerrels);
90 extern List *final_join_rels(List *join_rel_list);
93 * prototypes for path/prune.c
95 extern void prune_joinrels(List *rel_list);
96 extern void prune_rel_paths(List *rel_list);
97 extern Path *prune_rel_path(Rel *rel, Path *unorderedpath);
98 extern List *merge_joinrels(List *rel_list1, List *rel_list2);
99 extern List *prune_oldrels(List *old_rels);