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https://issues.apache.org/jira/browse/HIVE-331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679799#action_12679799
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Joydeep Sen Sarma commented on HIVE-331:
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how is this different from cluster by? U can do a union of two tables and
cluster the union on the column(s) that require co-grouping. If the desire is
to have co-groups with different schemas - it hadn't been clear to us how we
could support this in the language (how can a reducer ingest rows with
different schemas) - and this didn't seem like a big deal since one could add
dummy rows or do map-side transformations to homogenize.
> [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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