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From "Jeff Hammerbacher (JIRA)" <>
Subject [jira] Commented: (HIVE-707) add group_concat
Date Wed, 24 Nov 2010 20:03:14 GMT


Jeff Hammerbacher commented on HIVE-707:


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.


> add group_concat
> ----------------
>                 Key: HIVE-707
>                 URL:
>             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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