@ConstantFunction(name = "seconds_add", argTypes = {DATETIME, INT}, returnType = DATETIME, isMonotonic = true)
    public static ConstantOperator secondsAdd(ConstantOperator date, ConstantOperator second) {
        return ConstantOperator.createDatetimeOrNull(date.getDatetime().plusSeconds(second.getInt()));
    }
@Test
    public void secondsAdd() {
        assertEquals("2015-03-23T09:24:05",
                ScalarOperatorFunctions.secondsAdd(O_DT_20150323_092355, O_INT_10).getDatetime().toString());
    }