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From "Mahsa Mofidpoor (JIRA)" <>
Subject [jira] [Commented] (HIVE-2845) Add support for index joins in Hive
Date Sat, 28 Jul 2012 16:50:35 GMT


Mahsa Mofidpoor commented on HIVE-2845:

Can you please clarify on the new changes in more details?
> Add support for index joins in Hive
> -----------------------------------
>                 Key: HIVE-2845
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: Indexing, Query Processor
>            Reporter: Namit Jain
>              Labels: 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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