Hive: select by alias and order by column name

Question

Current query, which doesn't work:

select datetime as a
from coffee_chain
order by datetime;

Can some one know the reason.

Answer 1

use

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