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https://issues.apache.org/jira/browse/HIVE-4952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727502#comment-13727502
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Hudson commented on HIVE-4952:
------------------------------
FAILURE: Integrated in Hive-trunk-hadoop2-ptest #41 (See
[https://builds.apache.org/job/Hive-trunk-hadoop2-ptest/41/])
HIVE-4952 : When hive.join.emit.interval is small, queries optimized by
Correlation Optimizer may generate wrong results (Yin Huai via Ashutosh
Chauhan) (hashutosh:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1509542)
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/DemuxOperator.java
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/correlation/QueryPlanTreeTransformation.java
* /hive/trunk/ql/src/test/queries/clientpositive/correlationoptimizer15.q
* /hive/trunk/ql/src/test/results/clientpositive/correlationoptimizer15.q.out
> When hive.join.emit.interval is small, queries optimized by Correlation
> Optimizer may generate wrong results
> ------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-4952
> URL: https://issues.apache.org/jira/browse/HIVE-4952
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.12.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Fix For: 0.12.0
>
> Attachments: HIVE-4952.D11889.1.patch, HIVE-4952.D11889.2.patch,
> replay.txt
>
>
> If we have a query like this ...
> {code:sql}
> SELECT xx.key, xx.cnt, yy.key
> FROM
> (SELECT x.key as key, count(1) as cnt FROM src1 x JOIN src1 y ON (x.key =
> y.key) group by x.key) xx
> JOIN src yy
> ON xx.key=yy.key;
> {\code}
> After Correlation Optimizer, the operator tree in the reducer will be
> {code}
> JOIN2
> |
> |
> MUX
> / \
> / \
> GBY |
> | |
> JOIN1 |
> \ /
> \ /
> DEMUX
> {\code}
> For JOIN2, the right table will arrive at this operator first. If
> hive.join.emit.interval is small, e.g. 1, JOIN2 will output the results even
> it has not got any row from the left table. The logic related
> hive.join.emit.interval in JoinOperator assumes that inputs will be ordered
> by the tag. But, if a query has been optimized by Correlation Optimizer, this
> assumption may not hold for those JoinOperators inside the reducer.
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