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https://issues.apache.org/jira/browse/HIVE-3673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491030#comment-13491030
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Kevin Wilfong commented on HIVE-3673:
-------------------------------------
https://reviews.facebook.net/D6483
> 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
>
>
> 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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