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Major planner/optimizer revision: get rid of PathOrder node type,

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store all ordering information in pathkeys lists (which are now lists of
lists of PathKeyItem nodes, not just lists of lists of vars).  This was
a big win --- the code is smaller and IMHO more understandable than it
was, even though it handles more cases.  I believe the node changes will
not force an initdb for anyone; planner nodes don't show up in stored
rules.
This commit is contained in:
Tom Lane
1999-08-16 02:17:58 +00:00
parent 08320bfb22
commit e6381966c1
43 changed files with 1937 additions and 3270 deletions
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49
src/include/optimizer/paths.h
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@@ -7,7 +7,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: paths.h,v 1.33 1999/07/27 06:23:11 tgl Exp $
* $Id: paths.h,v 1.34 1999/08/16 02:17:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -43,35 +43,28 @@ extern void update_rels_pathlist_for_joins(Query *root, List *joinrels);
extern List *create_or_index_paths(Query *root, RelOptInfo *rel, List *clauses);
/*
* hashutils.c
* routines to deal with hash keys and clauses
* pathkeys.c
* utilities for matching and building path keys
*/
extern List *group_clauses_by_hashop(List *restrictinfo_list,
Relids inner_relids);
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;
/*
* joinutils.c
* generic join method key/clause routines
*/
extern bool order_joinkeys_by_pathkeys(List *pathkeys,
List *joinkeys, List *joinclauses, int outer_or_inner,
List **matchedJoinKeysPtr,
List **matchedJoinClausesPtr);
extern List *make_pathkeys_from_joinkeys(List *joinkeys, List *tlist,
int outer_or_inner);
extern Path *get_cheapest_path_for_joinkeys(List *joinkeys,
PathOrder *ordering, List *paths, int outer_or_inner);
extern List *new_join_pathkeys(List *outer_pathkeys,
List *join_rel_tlist, List *joinclauses);
/*
* mergeutils.c
* routines to deal with merge keys and clauses
*/
extern List *group_clauses_by_order(List *restrictinfo_list,
Relids inner_relids);
extern MergeInfo *match_order_mergeinfo(PathOrder *ordering,
List *mergeinfo_list);
extern PathKeysComparison compare_pathkeys(List *keys1, List *keys2);
extern bool pathkeys_contained_in(List *keys1, List *keys2);
extern Path *get_cheapest_path_for_pathkeys(List *paths, List *pathkeys);
extern List *build_index_pathkeys(Query *root, RelOptInfo *rel,
RelOptInfo *index);
extern List *build_join_pathkeys(List *outer_pathkeys,
List *join_rel_tlist, List *joinclauses);
extern List *find_mergeclauses_for_pathkeys(List *pathkeys,
List *restrictinfos);
extern List *make_pathkeys_for_mergeclauses(List *mergeclauses,
List *tlist);
/*
* joinrels.c