ORDER BY与GROUP BY衍生列未添加表名或表别名

[hanahmily]

1. order by 生成的补充列不带所有表的别名
   bug现象

select ... order_id AS sharding_gen_1 from order a order by a.order_id

应该为

select ... a.order_id AS sharding_gen_1 from order a order by a.order_id

1. group by 生成补充列时没有判断查询投射中是否已经存在了该列
   bug现象

select a.order_id, order_id AS sharding_gen_1 from order a group by a.order_id

应该为

select a.order_id  from order a order by a.order_id