Hive：按别名选择，按列名排序

Question

当前查询，不起作用：

select datetime as a
from coffee_chain
order by datetime;

有人可以知道原因。

Answer 1

采用

select datetime as a from coffee_chain order by a;

https://issues.apache.org/jira/browse/HIVE-1449

---

hive> create table coffee_chain (datetime int);
OK

hive> select datetime as a from coffee_chain order by datetime;

 FAILED: SemanticException Line 0:-1 Invalid table alias or column reference 'datetime': (possible column names are: a) 

hive> select datetime as a from coffee_chain order by a;
OK