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https://issues.apache.org/jira/browse/HIVE-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715624#action_12715624
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Namit Jain commented on HIVE-195:
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Some cleanups can be performed in follow-ups.
Filed new JIRAS:
https://issues.apache.org/jira/browse/HIVE-528
https://issues.apache.org/jira/browse/HIVE-529
https://issues.apache.org/jira/browse/HIVE-530
https://issues.apache.org/jira/browse/HIVE-531
> map-side joins are not supported
> --------------------------------
>
> Key: HIVE-195
> URL: https://issues.apache.org/jira/browse/HIVE-195
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: 195.patch1.txt, 195.patch2.txt, 195.patch3.txt
>
>
> map-side joins are not supported.
> If all the tables but one are small and can fit in memory, the join should be
> performed on the map-side. Ideally, it should be all cost-based, but
> to start with, the user should be given an option to specify that he needs a
> map-side join.
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