text: -- @testpoint: 多次查询
  drop table if exists t_abs;
  create table t_abs(c_id int);
  insert into t_abs VALUES(002);
  insert into t_abs VALUES(125);
  insert into t_abs VALUES(056);
  insert into t_abs VALUES(089);
  insert into t_abs VALUES(256);
  select abs(c_id) t1,abs(c_id) t2 from t_abs where c_id is not null order by t1,t2;
  drop table if exists t_abs;