diff options
| -rw-r--r-- | src/backend/optimizer/util/clauses.c | 54 |
1 files changed, 53 insertions, 1 deletions
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c index 5570b33f485..73fe60bd24e 100644 --- a/src/backend/optimizer/util/clauses.c +++ b/src/backend/optimizer/util/clauses.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.216 2006/08/02 01:59:46 joe Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.217 2006/08/04 14:09:51 tgl Exp $ * * HISTORY * AUTHOR DATE MAJOR EVENT @@ -2092,6 +2092,58 @@ eval_const_expressions_mutator(Node *node, 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 |