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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4540) JOIN-GRP BY-DISTINCT fails with NPE when mapjoin.mapreduce=true
Date Fri, 10 May 2013 18:39:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13654706#comment-13654706
] 

Gunther Hagleitner commented on HIVE-4540:
------------------------------------------

Review: https://reviews.facebook.net/D10743
                
> JOIN-GRP BY-DISTINCT fails with NPE when mapjoin.mapreduce=true
> ---------------------------------------------------------------
>
>                 Key: HIVE-4540
>                 URL: https://issues.apache.org/jira/browse/HIVE-4540
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gunther Hagleitner
>            Assignee: Gunther Hagleitner
>         Attachments: HIVE-4540.1.patch
>
>
> If the mapjoin.mapreduce optimization kicks in on a query of this form:
> {noformat}
> select count(distinct a.v) 
> from a join b on (a.k = b.k)
> group by a.g
> {noformat}
> The planer will NPE in the metadataonly optimizer.

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