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Add the ability to extract OR indexscan conditions from OR-of-AND

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join conditions in which each OR subclause includes a constraint on
the same relation.  This implements the other useful side-effect of
conversion to CNF format, without its unpleasant side-effects.  As
per pghackers discussion of a few weeks ago.
This commit is contained in:
Tom Lane
2004-01-05 05:07:36 +00:00
parent bf488a6842
commit 9091e8d1b2
16 changed files with 438 additions and 295 deletions
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3
src/include/optimizer/cost.h
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@@ -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/cost.h,v 1.59 2004/01/04 03:51:52 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.60 2004/01/05 05:07:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -49,6 +49,7 @@ extern bool enable_nestloop;
extern bool enable_mergejoin;
extern bool enable_hashjoin;
extern double clamp_row_est(double nrows);
extern void cost_seqscan(Path *path, Query *root,
RelOptInfo *baserel);
extern void cost_index(Path *path, Query *root,

4
src/include/optimizer/paths.h
View File

@@ -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 1.71 2004/01/04 00:07:32 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.72 2004/01/05 05:07:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -43,11 +43,13 @@ extern List *group_clauses_by_indexkey_for_or(RelOptInfo *rel,
Expr *orsubclause);
extern List *expand_indexqual_conditions(IndexOptInfo *index,
List *clausegroups);
extern void check_partial_indexes(Query *root, RelOptInfo *rel);
/*
* orindxpath.c
* additional routines for indexable OR clauses
*/
extern bool create_or_index_quals(Query *root, RelOptInfo *rel);
extern void create_or_index_paths(Query *root, RelOptInfo *rel);
/*

5
src/include/optimizer/restrictinfo.h
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@@ -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 1.21 2004/01/04 00:07:32 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.22 2004/01/05 05:07:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,7 +16,8 @@
#include "nodes/relation.h"
extern RestrictInfo *make_restrictinfo(Expr *clause, bool ispusheddown);
extern RestrictInfo *make_restrictinfo(Expr *clause, bool is_pushed_down,
bool valid_everywhere);
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,