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From "Mahsa Mofidpoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2845) Add support for index joins in Hive
Date Mon, 09 Jul 2012 00:23:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409115#comment-13409115
] 

Mahsa Mofidpoor commented on HIVE-2845:
---------------------------------------

what will be the operator rule that matches with this? Is it a join followed by a tablescan("JOIN%.*TS")?

                
> Add support for index joins in Hive
> -----------------------------------
>
>                 Key: HIVE-2845
>                 URL: https://issues.apache.org/jira/browse/HIVE-2845
>             Project: Hive
>          Issue Type: New Feature
>          Components: Indexing, Query Processor
>            Reporter: Namit Jain
>              Labels: gsoc, gsoc2012, indexing, joins, performance
>
> Hive supports indexes, which are used for filters currently.
> It would be very useful to add support for index-based joins in Hive.
> If 2 tables A and B are being joined, and an index exists on the join key of A,
> B can be scanned (by the mappers), and for each row in B, a lookup for the corresponding
row in A can be performed.
> This can be very useful for some usecases.

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