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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-707) add group_concat
Date Wed, 29 Jul 2009 15:52:14 GMT
add group_concat
----------------

                 Key: HIVE-707
                 URL: https://issues.apache.org/jira/browse/HIVE-707
             Project: Hadoop 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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