index 5570b33f485d0a346c8a88d9e6788ea4a5d53102..73fe60bd24eb39eb9c3ab95d186792902d37010d 100644 (file)
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.216 2006年08月02日 01:59:46 joe Exp $
+ * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.217 2006年08月04日 14:09:51 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
newfselect->resulttypmod = fselect->resulttypmod;
return (Node *) newfselect;
}
+ if (IsA(node, BooleanTest))
+ {
+ BooleanTest *btest = (BooleanTest *) node;
+ BooleanTest *newbtest;
+ Node *arg;
+
+ arg = eval_const_expressions_mutator((Node *) btest->arg,
+ context);
+ if (arg && IsA(arg, Const))
+ {
+ Const *carg = (Const *) arg;
+ bool result;
+
+ switch (btest->booltesttype)
+ {
+ case IS_TRUE:
+ result = (!carg->constisnull &&
+ DatumGetBool(carg->constvalue));
+ break;
+ case IS_NOT_TRUE:
+ result = (carg->constisnull ||
+ !DatumGetBool(carg->constvalue));
+ break;
+ case IS_FALSE:
+ result = (!carg->constisnull &&
+ !DatumGetBool(carg->constvalue));
+ break;
+ case IS_NOT_FALSE:
+ result = (carg->constisnull ||
+ DatumGetBool(carg->constvalue));
+ break;
+ case IS_UNKNOWN:
+ result = carg->constisnull;
+ break;
+ case IS_NOT_UNKNOWN:
+ result = !carg->constisnull;
+ break;
+ default:
+ elog(ERROR, "unrecognized booltesttype: %d",
+ (int) btest->booltesttype);
+ result = false; /* keep compiler quiet */
+ break;
+ }
+
+ return makeBoolConst(result, false);
+ }
+
+ newbtest = makeNode(BooleanTest);
+ newbtest->arg = (Expr *) arg;
+ newbtest->booltesttype = btest->booltesttype;
+ return (Node *) newbtest;
+ }
/*
* For any node type not handled above, we recurse using