*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.27 1999/02/18 00:49:20 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.28 1999/02/18 04:45:36 momjian Exp $
*
*-------------------------------------------------------------------------
*/
* of these exist for a given relation, all remaining possibilities are
* considered.
*
- * 'outer_rels' is the list of rel nodes
- *
* Returns a list of rel nodes corresponding to the new join relations.
*/
List *
-make_rels_by_joins(Query *root, List *outer_rels)
+make_rels_by_joins(Query *root, List *old_rels)
{
- List *joins = NIL;
+ List *joined_rels = NIL;
List *join_list = NIL;
List *r = NIL;
- foreach(r, outer_rels)
+ foreach(r, old_rels)
{
- RelOptInfo *outer_rel = (RelOptInfo *) lfirst(r);
+ RelOptInfo *old_rel = (RelOptInfo *) lfirst(r);
- if (!(joins = make_rels_by_clause_joins(root, outer_rel,
- outer_rel->joininfo,
+ if (!(joined_rels = make_rels_by_clause_joins(root, old_rel,
+ old_rel->joininfo,
NIL)))
{
/*
* Oops, we have a relation that is not joined to any other
* relation. Cartesian product time.
*/
- if (!BushyPlanFlag)
- joins = make_rels_by_clauseless_joins(outer_rel,
- root->base_rel_list);
- else
- joins = make_rels_by_clauseless_joins(outer_rel, outer_rels);
+ joined_rels = make_rels_by_clauseless_joins(old_rel,
+ root->base_rel_list);
+ if (BushyPlanFlag)
+ joined_rels = make_rels_by_clauseless_joins(old_rel,
+ old_rels);
}
- join_list = nconc(join_list, joins);
+ join_list = nconc(join_list, joined_rels);
}
return join_list;
* Returns a list of new join relations.
*/
List *
-make_rels_by_clause_joins(Query *root, RelOptInfo *outer_rel,
+make_rels_by_clause_joins(Query *root, RelOptInfo *old_rel,
List *joininfo_list, Relids only_relids)
{
List *join_list = NIL;
foreach(i, joininfo_list)
{
JoinInfo *joininfo = (JoinInfo *) lfirst(i);
- RelOptInfo *rel;
+ RelOptInfo *joined_rel;
Relids unjoined_relids = joininfo->unjoined_relids;
if (unjoined_relids != NIL)
/* geqo only wants certain relids to make new rels */
intMember(lfirsti(unjoined_relids), only_relids)))
{
- rel = make_join_rel(outer_rel,
- get_base_rel(root, lfirsti(unjoined_relids)),
+ joined_rel = make_join_rel(old_rel,
+ get_base_rel(root,
+ lfirsti(unjoined_relids)),
joininfo);
- join_list = lappend(join_list, rel);
+ join_list = lappend(join_list, joined_rel);
/* Right-sided plan */
if (_use_right_sided_plans_ &&
- length(outer_rel->relids) > 1)
+ length(old_rel->relids) > 1)
{
- rel = make_join_rel(
+ joined_rel = make_join_rel(
get_base_rel(root, lfirsti(unjoined_relids)),
- outer_rel,
- joininfo);
- join_list = lappend(join_list, rel);
+ old_rel,
+ joininfo);
+ join_list = lappend(join_list, joined_rel);
}
}
Assert(length(join_rel->relids) > 1);
if (is_subset(unjoined_relids, join_rel->relids) &&
- nonoverlap_sets(outer_rel->relids, join_rel->relids))
+ nonoverlap_sets(old_rel->relids, join_rel->relids))
{
- rel = make_join_rel(outer_rel,
- join_rel,
- joininfo);
- join_list = lappend(join_list, rel);
-
- /* Right-sided plan */
- if (_use_right_sided_plans_ &&
- length(outer_rel->relids) > 1)
- {
- rel = make_join_rel(join_rel,
- outer_rel,
- joininfo);
- join_list = lappend(join_list, rel);
- }
+ joined_rel = make_join_rel(old_rel,
+ join_rel,
+ joininfo);
+ join_list = lappend(join_list, joined_rel);
}
}
}
* Returns a list of new join relations.
*/
List *
-make_rels_by_clauseless_joins(RelOptInfo *outer_rel, List *inner_rels)
+make_rels_by_clauseless_joins(RelOptInfo *old_rel, List *inner_rels)
{
RelOptInfo *inner_rel;
List *t_list = NIL;
foreach(i, inner_rels)
{
inner_rel = (RelOptInfo *) lfirst(i);
- if (nonoverlap_sets(inner_rel->relids, outer_rel->relids))
+ if (nonoverlap_sets(inner_rel->relids, old_rel->relids))
{
t_list = lappend(t_list,
- make_join_rel(outer_rel,
+ make_join_rel(old_rel,
inner_rel,
(JoinInfo *) NULL));
}
* of the outer and inner join relations and then merging the results
* together.
*/
- new_outer_tlist = new_join_tlist(outer_rel->targetlist, /* XXX 1-based attnos */
- inner_rel->relids, 1);
- new_inner_tlist = new_join_tlist(inner_rel->targetlist, /* XXX 1-based attnos */
- outer_rel->relids,
- length(new_outer_tlist) + 1);
+ new_outer_tlist = new_join_tlist(outer_rel->targetlist, 1);
+ new_inner_tlist = new_join_tlist(inner_rel->targetlist,
+ length(new_outer_tlist) + 1);
joinrel->relids = NIL;
joinrel->indexed = false;
*/
List *
new_join_tlist(List *tlist,
- Relids other_relids,
int first_resdomno)
{
int resdomno = first_resdomno - 1;
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: paths.h,v 1.21 1999/02/18 00:49:47 momjian Exp $
+ * $Id: paths.h,v 1.22 1999/02/18 04:45:36 momjian Exp $
*
*-------------------------------------------------------------------------
*/
* joinrels.h
* routines to determine which relations to join
*/
-extern List *make_rels_by_joins(Query *root, List *outer_rels);
-extern List *make_rels_by_clause_joins(Query *root, RelOptInfo *outer_rel,
+extern List *make_rels_by_joins(Query *root, List *old_rels);
+extern List *make_rels_by_clause_joins(Query *root, RelOptInfo *old_rel,
List *joininfo_list, Relids only_relids);
-extern List *make_rels_by_clauseless_joins(RelOptInfo *outer_rel,
+extern List *make_rels_by_clauseless_joins(RelOptInfo *old_rel,
List *inner_rels);
extern RelOptInfo *make_join_rel(RelOptInfo *outer_rel, RelOptInfo *inner_rel, JoinInfo *joininfo);
-extern List *new_join_tlist(List *tlist, List *other_relids,int first_resdomno);
+extern List *new_join_tlist(List *tlist, int first_resdomno);
extern RelOptInfo *get_cheapest_complete_rel(List *join_rel_list);
/*
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