Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/4182#issuecomment-71308134
@rxin, for the example `select key as (k1, k2) from src limit 5`
k1 and k2 both are alias for `key`. And i tested with hive and HiveQL
supported this, here is test case in hive:
```
select stack(2, *) as (e1,e2,e3) from (
select concat(*), concat(a.*), concat(b.*), concat(a.*, b.key),
concat(a.key, b.*)
from src a join src b on a.key+1=b.key where a.key < 100) x limit 10;
```
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