text: -- @testpoint: opengauss比较操作符<,比较类型:VARCHAR&CHARACTER VARYING
  drop table if exists ts_zhparser;
  CREATE TABLE ts_zhparser(id VARCHAR(5), index CHARACTER VARYING(5));
  INSERT INTO ts_zhparser VALUES('stu', 'stude');
  select * from ts_zhparser where id < index;
  drop table if exists ts_zhparser;