@Description("arc sine")
    @ScalarFunction
    @SqlType(StandardTypes.DOUBLE)
    public static double asin(@SqlType(StandardTypes.DOUBLE) double num)
    {
        return Math.asin(num);
    }
@Test
    public void testAsin()
    {
        for (double doubleValue : DOUBLE_VALUES) {
            assertFunction("asin(" + doubleValue + ")", DOUBLE, Math.asin(doubleValue));
            assertFunction("asin(REAL '" + (float) doubleValue + "')", DOUBLE, Math.asin((float) doubleValue));
        }
        assertFunction("asin(NULL)", DOUBLE, null);
    }