text: -- @testpoint: opengauss比较操作符!=,异常校验，合理报错
  -- 报错校验，不能隐式转换的不同类型，少参、空值
  select point(1,2) != '22'::smallint as result;
  SELECT -222::INTEGER != -222::INTEGER != 221::INTEGER;
  SELECT  != 221::INTEGER;
  SELECT '' != 221::INTEGER;