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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3199) support select distinct *
Date Mon, 19 Jan 2015 18:09:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14282786#comment-14282786
] 

Pengcheng Xiong commented on HIVE-3199:
---------------------------------------

[~shane.huang], w.r.t. the JIRA HIVE-9194, shall we close this issue? Thanks.

> support select distinct *
> -------------------------
>
>                 Key: HIVE-3199
>                 URL: https://issues.apache.org/jira/browse/HIVE-3199
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>    Affects Versions: 0.9.0
>            Reporter: Shane Huang
>         Attachments: HIVE-3199.for0.9.0.patch
>
>
> Error is reported when running query "select distinct * from t". 
> It is a common feature that is better to be supported.
> Did some investigation about this issue. In current implementation "select distinct a,b,c
from t" is translated to "select a,b,c from t group by a,b,c". So select distinct * is translated
literally to "select * from group by *". But * is not handled properly when processing groupby
expressions. 



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