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Teach push_nots() how to negate a ScalarArrayOpExpr. In passing, save 

a palloc or two in the OpExpr case.
This commit is contained in:
Tom Lane 2005-11-26 18:07:40 +00:00
parent 4c4eb57154
commit a66e2c8885
1 changed files with 35 additions and 6 deletions
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41
src/backend/optimizer/prep/prepqual.c
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@ -25,7 +25,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/prep/prepqual.c,v 1.52 2005/11/22 18:17:14 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/prep/prepqual.c,v 1.53 2005/11/26 18:07:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -212,11 +212,40 @@ push_nots(Expr *qual)
Oid negator = get_negator(opexpr->opno);
if (negator)
return make_opclause(negator,
opexpr->opresulttype,
opexpr->opretset,
(Expr *) get_leftop(qual),
(Expr *) get_rightop(qual));
{
OpExpr *newopexpr = makeNode(OpExpr);
newopexpr->opno = negator;
newopexpr->opfuncid = InvalidOid;
newopexpr->opresulttype = opexpr->opresulttype;
newopexpr->opretset = opexpr->opretset;
newopexpr->args = opexpr->args;
return (Expr *) newopexpr;
}
else
return make_notclause(qual);
}
else if (qual && IsA(qual, ScalarArrayOpExpr))
{
/*
* Negate a ScalarArrayOpExpr if there is a negator for its operator;
* for example x = ANY (list) becomes x <> ALL (list).
* Otherwise, retain the clause as it is (the NOT can't be pushed down
* any farther).
*/
ScalarArrayOpExpr *saopexpr = (ScalarArrayOpExpr *) qual;
Oid negator = get_negator(saopexpr->opno);
if (negator)
{
ScalarArrayOpExpr *newopexpr = makeNode(ScalarArrayOpExpr);
newopexpr->opno = negator;
newopexpr->opfuncid = InvalidOid;
newopexpr->useOr = !saopexpr->useOr;
newopexpr->args = saopexpr->args;
return (Expr *) newopexpr;
}
else
return make_notclause(qual);
}