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Adjust indexscan planning logic to keep RestrictInfo nodes associated

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with index qual clauses in the Path representation.  This saves a little
work during createplan and (probably more importantly) allows reuse of
cached selectivity estimates during indexscan planning.  Also fix latent
bug: wrong plan would have been generated for a 'special operator' used
in a nestloop-inner-indexscan join qual, because the special operator
would not have gotten into the list of quals to recheck.  This bug is
only latent because at present the special-operator code could never
trigger on a join qual, but sooner or later someone will want to do it.
This commit is contained in:
Tom Lane
2004-01-05 23:39:54 +00:00
parent 5d472f6464
commit fa559a86ee
11 changed files with 400 additions and 188 deletions
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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 1.72 2004/01/05 05:07:36 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/paths.h,v 1.73 2004/01/05 23:39:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -44,6 +44,8 @@ extern List *group_clauses_by_indexkey_for_or(RelOptInfo *rel,
extern List *expand_indexqual_conditions(IndexOptInfo *index,
List *clausegroups);
extern void check_partial_indexes(Query *root, RelOptInfo *rel);
extern List *flatten_clausegroups_list(List *clausegroups);
extern Expr *make_expr_from_indexclauses(List *indexclauses);
/*
* orindxpath.c

5
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 1.22 2004/01/05 05:07:36 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/restrictinfo.h,v 1.23 2004/01/05 23:39:54 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -18,6 +18,9 @@
extern RestrictInfo *make_restrictinfo(Expr *clause, bool is_pushed_down,
bool valid_everywhere);
extern List *make_restrictinfo_from_indexclauses(List *indexclauses,
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,