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https://issues.apache.org/jira/browse/HIVE-331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680342#action_12680342
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Namit Jain commented on HIVE-331:
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The idea was to merge different rows:
For eg:
A 1 2
A 3 4
A 5
should yield 1 row
A 1 2 3 4 5
I was mistaken about co-group. I thought, it did that. I agree, the user can
always write a custom reducer for that. The idea was to make it simpler.
But, after looking at the documentation of co-group, this is redundant
> [hive] implement co-group
> -------------------------
>
> Key: HIVE-331
> URL: https://issues.apache.org/jira/browse/HIVE-331
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
>
> Equivalent of co-group should be supported in Hive
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