text: drop table if exists t;
  create table t ( a json , id int, s varchar(10));
  insert into t(s) values ('aaa');
  select * from t;
  create view v_t ( id int, s varchar(10)) as select * from t union all select * from t;
  select * from v_t;
  drop view v_t;
  drop table if exists t;
  