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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-331) [hive] implement co-group
Date Sat, 07 Mar 2009 02:01:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679799#action_12679799
] 

Joydeep Sen Sarma commented on HIVE-331:
----------------------------------------

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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