mysql中间件kingshard

这样写是OK的：

select * from bind_history limit 10;
select id, passport_id, person_id, create_time, cast(is_bind AS char(1)) from bind_history_0000;

select id, passport_id, person_id, create_time, cast(is_bind AS char) from bind_history;

select id, passport_id, person_id, create_time, convert(is_bind,char(1))  from account.passport_bind_history limit 10;

select id, passport_id, person_id, create_time, convert(is_bind,char)  from account.passport_bind_history limit 10;

这样写不行：
select id, passport_id, person_id, create_time, cast(is_bind AS char(1)) from bind_history;

不建议使用