add group_concat
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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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