public static boolean test(byte type) throws ExecException {
Random r = new Random();
ConstantExpression lt = (ConstantExpression) GenPhyOp.exprConst();
lt.setResultType(type);
Tuple dummyTuple = TupleFactory.getInstance().newTuple(1);
lt.attachInput(dummyTuple);
POIsNull isNullExpr = (POIsNull) GenPhyOp.compIsNullExpr();
isNullExpr.setExpr(lt);
isNullExpr.setOperandType(type);
Object inp1;