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From "Namit Jain (JIRA)" <>
Subject [jira] Resolved: (HIVE-1194) sorted merge join
Date Fri, 05 Mar 2010 00:59:27 GMT


Namit Jain resolved HIVE-1194.

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Committed. Thanks Yongqiang

> sorted merge join
> -----------------
>                 Key: HIVE-1194
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: He Yongqiang
>             Fix For: 0.6.0
>         Attachments: hive-1194-2010-02-28.patch, hive-1194-2010-3-2.2.patch, hive-1194-2010-3-2.patch,
hive-1194-2010-3-3-2.patch, hive-1194-2010-3-3.patch, hive-1194-2010-3-4.patch
> If the input tables are sorted on the join key, and a mapjoin is being performed, it
is useful to exploit the sorted properties of the table.
> This can lead to substantial cpu savings - this needs to work across bucketed map joins
> Since, sorted properties of a table are not enforced currently, a new parameter can be
added to specify to use the sort-merge join.

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