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https://issues.apache.org/jira/browse/HIVE-3673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491703#comment-13491703
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Hudson commented on HIVE-3673:
------------------------------
Integrated in Hive-trunk-h0.21 #1775 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/1775/])
HIVE-3673 Sort merge join not used when join columns have different names
(Kevin Wilfong via namit) (Revision 1406090)
Result = FAILURE
namit : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1406090
Files :
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/SortedMergeBucketMapJoinOptimizer.java
* /hive/trunk/ql/src/test/queries/clientpositive/smb_mapjoin_13.q
* /hive/trunk/ql/src/test/results/clientpositive/smb_mapjoin_13.q.out
> 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
> Fix For: 0.10.0
>
> 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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