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Fix testing of partial-index predicates to work correctly in cases where 

varno of index's relation is not 1.  This embarrassing oversight pointed
out by Dmitry Tkach 12-Jul-02.
This commit is contained in:
Tom Lane 2002-07-13 19:20:34 +00:00
parent 59097af0bb
commit 942a2e94fa
1 changed files with 19 additions and 4 deletions
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23
src/backend/optimizer/path/indxpath.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.119 2002/06/20 20:29:29 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.120 2002/07/13 19:20:34 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -35,6 +35,7 @@
#include "parser/parse_coerce.h"
#include "parser/parse_expr.h"
#include "parser/parse_oper.h"
#include "rewrite/rewriteManip.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/lsyscache.h"
@ -79,7 +80,7 @@ static bool match_clause_to_indexkey(RelOptInfo *rel, IndexOptInfo *index,
int indexkey, Oid opclass,
Expr *clause, bool join);
static bool pred_test(List *predicate_list, List *restrictinfo_list,
List *joininfo_list);
List *joininfo_list, int relvarno);
static bool pred_test_restrict_list(Expr *predicate, List *restrictinfo_list);
static bool pred_test_recurse_clause(Expr *predicate, Node *clause);
static bool pred_test_recurse_pred(Expr *predicate, Node *clause);
@ -153,7 +154,8 @@ create_index_paths(Query *root, RelOptInfo *rel)
* predicate test.
*/
if (index->indpred != NIL)
if (!pred_test(index->indpred, restrictinfo_list, joininfo_list))
if (!pred_test(index->indpred, restrictinfo_list, joininfo_list,
lfirsti(rel->relids)))
continue;
/*
@ -957,7 +959,8 @@ indexable_operator(Expr *clause, Oid opclass, bool indexkey_on_left)
* to CNF format). --Nels, Jan '93
*/
static bool
pred_test(List *predicate_list, List *restrictinfo_list, List *joininfo_list)
pred_test(List *predicate_list, List *restrictinfo_list, List *joininfo_list,
int relvarno)
{
List *pred;
@ -980,6 +983,18 @@ pred_test(List *predicate_list, List *restrictinfo_list, List *joininfo_list)
return false; /* no restriction clauses: the test must
* fail */
/*
* The predicate as stored in the index definition will use varno 1
* for its Vars referencing the indexed relation. If the indexed
* relation isn't varno 1 in the query, we must adjust the predicate
* to make the Vars match, else equal() won't work.
*/
if (relvarno != 1)
{
predicate_list = copyObject(predicate_list);
ChangeVarNodes((Node *) predicate_list, 1, relvarno, 0);
}
foreach(pred, predicate_list)
{
/*