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Fix oversight in indexscan plan creation. I recently added code to use

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predicate_implied_by() to detect redundant filter conditions, but forgot
that predicate_implied_by() assumes its first argument contains only
immutable functions.  Add a check to guarantee that.  Also, test to see
if filter conditions can be discarded because they are redundant with
the predicate of a partial index.
This commit is contained in:
Tom Lane
2005-10-06 16:01:55 +00:00
parent e9f11c6b64
commit fa63749d21
2 changed files with 37 additions and 10 deletions
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4
src/backend/optimizer/util/predtest.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/predtest.c,v 1.2 2005/07/23 21:05:47 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/predtest.c,v 1.3 2005/10/06 16:01:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -47,7 +47,7 @@ static bool btree_predicate_proof(Expr *predicate, Node *clause,
* valid, but no worse consequences will ensue.
*
* We assume the predicate has already been checked to contain only
* immutable functions and operators. (In current use this is true
* immutable functions and operators. (In most current uses this is true
* because the predicate is part of an index predicate that has passed
* CheckPredicate().) We dare not make deductions based on non-immutable
* functions, because they might change answers between the time we make