hadoop-hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HIVE-1194) sorted merge join
Date Fri, 05 Mar 2010 00:59:27 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Namit Jain resolved HIVE-1194.
------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Committed. Thanks Yongqiang

> sorted merge join
> -----------------
>
>                 Key: HIVE-1194
>                 URL: https://issues.apache.org/jira/browse/HIVE-1194
>             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
also.
> Since, sorted properties of a table are not enforced currently, a new parameter can be
added to specify to use the sort-merge join.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message