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Rewrite OR indexscan processing to be more flexible. We can now for the

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first time generate an OR indexscan for a two-column index when the WHERE
condition is like 'col1 = foo AND (col2 = bar OR col2 = baz)' --- before,
the OR had to be on the first column of the index or we'd not notice the
possibility of using it.  Some progress towards extracting OR indexscans
from subclauses of an OR that references multiple relations, too, although
this code is #ifdef'd out because it needs more work.
This commit is contained in:
Tom Lane
2004-01-04 00:07:32 +00:00
parent 037e2fcf8f
commit 6cb1c0238b
11 changed files with 452 additions and 507 deletions
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8
src/include/optimizer/paths.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.70 2003/11/29 22:41:07 pgsql Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.71 2004/01/04 00:07:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -38,9 +38,9 @@ extern void debug_print_rel(Query *root, RelOptInfo *rel);
extern void create_index_paths(Query *root, RelOptInfo *rel);
extern Path *best_inner_indexscan(Query *root, RelOptInfo *rel,
Relids outer_relids, JoinType jointype);
extern List *extract_or_indexqual_conditions(RelOptInfo *rel,
IndexOptInfo *index,
Expr *orsubclause);
extern List *group_clauses_by_indexkey_for_or(RelOptInfo *rel,
IndexOptInfo *index,
Expr *orsubclause);
extern List *expand_indexqual_conditions(IndexOptInfo *index,
List *clausegroups);

3
src/include/optimizer/restrictinfo.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.20 2003/11/29 22:41:07 pgsql Exp $
* $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.21 2004/01/04 00:07:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,6 +16,7 @@
#include "nodes/relation.h"
extern RestrictInfo *make_restrictinfo(Expr *clause, bool ispusheddown);
extern bool restriction_is_or_clause(RestrictInfo *restrictinfo);
extern List *get_actual_clauses(List *restrictinfo_list);
extern void get_actual_join_clauses(List *restrictinfo_list,