@ConstantFunction(name = "subtract", argTypes = {LARGEINT, LARGEINT}, returnType = LARGEINT, isMonotonic = true)
    public static ConstantOperator subtractLargeInt(ConstantOperator first, ConstantOperator second) {
        return ConstantOperator.createLargeInt(first.getLargeInt().subtract(second.getLargeInt()));
    }
@Test
    public void subtractLargeInt() {
        assertEquals("0",
                ScalarOperatorFunctions.subtractLargeInt(O_LI_100, O_LI_100).getLargeInt().toString());
    }