@ScalarOperator(NOT_EQUAL)
    @SqlType(StandardTypes.BOOLEAN)
    @SqlNullable
    public static Boolean notEqual(@SqlType(StandardTypes.BOOLEAN) boolean left, @SqlType(StandardTypes.BOOLEAN) boolean right)
    {
        return left != right;
    }
@Test
    public void testNotEqual()
    {
        assertFunction("true <> true", BOOLEAN, false);
        assertFunction("true <> false", BOOLEAN, true);
        assertFunction("false <> true", BOOLEAN, true);
        assertFunction("false <> false", BOOLEAN, false);
    }