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From "Kevin Wilfong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3673) Sort merge join not used when join columns have different names
Date Tue, 06 Nov 2012 05:18:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491215#comment-13491215
] 

Kevin Wilfong commented on HIVE-3673:
-------------------------------------

Addressed comments.
                
> Sort merge join not used when join columns have different names
> ---------------------------------------------------------------
>
>                 Key: HIVE-3673
>                 URL: https://issues.apache.org/jira/browse/HIVE-3673
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.10.0
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-3673.1.patch.txt, HIVE-3673.2.patch.txt
>
>
> If two tables are joined on columns with different names, the sort merge join optimization
is not applied.  E.g.
> SELECT /*+ MAPJOIN(b) */ * FROM t1 a JOIN t2 b ON a.key = b.value;
> This will not use sort merge join even if t1 and t2 are bucketed and sorted by key, value
respectively.

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