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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-195) map-side joins are not supported
Date Tue, 30 Dec 2008 02:41:44 GMT

    [ https://issues.apache.org/jira/browse/HIVE-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659733#action_12659733
] 

Joydeep Sen Sarma commented on HIVE-195:
----------------------------------------

here's the ticket for the jdbm enhancement that might help:

https://sourceforge.net/tracker/?func=detail&atid=354155&aid=2475914&group_id=4155

> 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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