@ConstantFunction(name = "multiply", argTypes = {SMALLINT, SMALLINT}, returnType = SMALLINT)
    public static ConstantOperator multiplySmallInt(ConstantOperator first, ConstantOperator second) {
        return ConstantOperator.createSmallInt((short) Math.multiplyExact(first.getSmallint(), second.getSmallint()));
    }
@Test
    public void multiplySmallInt() {
        assertEquals(100,
                ScalarOperatorFunctions.multiplySmallInt(O_SI_10, O_SI_10).getSmallint());
    }