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Modify partial-index-predicate applicability tester to test whether

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clauses are equal(), before trying to match them up using btree opclass
inference rules.  This allows it to recognize many simple cases involving
non-btree operations, for example 'x IS NULL'.  Clean up code a little.
This commit is contained in:
Tom Lane
2001-08-06 18:09:45 +00:00
parent 7d6fbe15a2
commit 246793469e
3 changed files with 98 additions and 82 deletions
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6
src/backend/commands/indexcmds.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.53 2001/07/17 21:53:01 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.54 2001/08/06 18:09:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -146,10 +146,12 @@ DefineIndex(char *heapRelationName,
/*
* Convert the partial-index predicate from parsetree form to
* an implicit-AND qual expression, for easier evaluation at runtime.
* While we are at it, we reduce it to a canonical (CNF or DNF) form
* to simplify the task of proving implications.
*/
if (predicate != NULL && rangetable != NIL)
{
cnfPred = cnfify((Expr *) copyObject(predicate), true);
cnfPred = canonicalize_qual((Expr *) copyObject(predicate), true);
fix_opids((Node *) cnfPred);
CheckPredicate(cnfPred, rangetable, relationId);
}