You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@hive.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2013/01/09 11:28:40 UTC
[jira] [Commented] (HIVE-3673) Sort merge join not used when join
columns have different names
[ https://issues.apache.org/jira/browse/HIVE-3673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13548101#comment-13548101 ]
Hudson commented on HIVE-3673:
------------------------------
Integrated in Hive-trunk-hadoop2 #54 (See [https://builds.apache.org/job/Hive-trunk-hadoop2/54/])
HIVE-3673 Sort merge join not used when join columns have different names
(Kevin Wilfong via namit) (Revision 1406090)
Result = ABORTED
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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira