[jira] Commented: (HIVE-707) add group_concat

["Jeff Hammerbacher (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935463#action_12935463 ] 

Jeff Hammerbacher commented on HIVE-707:
----------------------------------------

Hey,

Given that this JIRA has been opened three separate times, and that I have received a recent request for it in IRC, I think it would be worth bumping to near the top of the queue.

Thanks,
Jeff

> add group_concat
> ----------------
>
>                 Key: HIVE-707
>                 URL: https://issues.apache.org/jira/browse/HIVE-707
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Min Zhou
>
> Moving the discussion to a new jira:
> I've implemented group_cat() in a rush, and found something difficult to slove:
> 1. function group_cat() has a internal order by clause, currently, we can't implement such an aggregation in hive.
> 2. when the strings will be group concated are too large, in another words, if data skew appears, there is often not enough memory to store such a big result.

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