@Description("Euler's number raised to the given power")
    @ScalarFunction
    @SqlType(StandardTypes.DOUBLE)
    public static double exp(@SqlType(StandardTypes.DOUBLE) double num)
    {
        return Math.exp(num);
    }
@Test
    public void testExp()
    {
        for (double doubleValue : DOUBLE_VALUES) {
            assertFunction("exp(" + doubleValue + ")", DOUBLE, Math.exp(doubleValue));
            assertFunction("exp(REAL '" + (float) doubleValue + "')", DOUBLE, Math.exp((float) doubleValue));
        }
        assertFunction("exp(NULL)", DOUBLE, null);
    }