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Posted to dev@hive.apache.org by "binlijin (JIRA)" <ji...@apache.org> on 2012/04/24 04:54:34 UTC

[jira] [Commented] (HIVE-2801) When join key is null, random distribute this tuple

    [ https://issues.apache.org/jira/browse/HIVE-2801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260166#comment-13260166 ] 

binlijin commented on HIVE-2801:
--------------------------------

If one table's join key have many null key, in reduce the data is skew. so if we random distribute the null key will sovle the skew problem.
                
> When join key is null, random distribute this tuple
> ---------------------------------------------------
>
>                 Key: HIVE-2801
>                 URL: https://issues.apache.org/jira/browse/HIVE-2801
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: binlijin
>            Assignee: binlijin
>         Attachments: HIVE-2801.patch
>
>


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