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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-964) handle skewed keys for a join in a separate job
Date Fri, 15 Jan 2010 19:52:54 GMT

    [ https://issues.apache.org/jira/browse/HIVE-964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800883#action_12800883
] 

Ning Zhang commented on HIVE-964:
---------------------------------

the current patch does not contain the UnionStructObjectInspector change. Yongqiang is redoing
that changes now.

> handle skewed keys for a join in a separate job
> -----------------------------------------------
>
>                 Key: HIVE-964
>                 URL: https://issues.apache.org/jira/browse/HIVE-964
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: He Yongqiang
>         Attachments: hive-964-2009-12-17.txt, hive-964-2009-12-28-2.patch, hive-964-2009-12-29-4.patch,
hive-964-2010-01-08.patch, hive-964-2010-01-13-2.patch, hive-964-2010-01-14-3.patch
>
>
> The skewed keys can be written to a temporary table or file, and a followup conditional
task can be used to perform the join on those keys.
> As a first step, JDBM can be used for those keys

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