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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11714) Turn off hybrid grace hash join for cross product join
Date Wed, 23 Sep 2015 21:17:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14905274#comment-14905274
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Gunther Hagleitner commented on HIVE-11714:
-------------------------------------------

LGTM +1. Can you add a test for it?

> Turn off hybrid grace hash join for cross product join
> ------------------------------------------------------
>
>                 Key: HIVE-11714
>                 URL: https://issues.apache.org/jira/browse/HIVE-11714
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 1.2.0
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>         Attachments: HIVE-11714.1.patch
>
>
> Current partitioning calculation is solely based on hash value of the key. For cross
product join where keys are empty, all the rows will be put into partition 0. This falls back
to the regular mapjoin behavior where we only have one hashtable.



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