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https://issues.apache.org/jira/browse/HIVE-2206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai updated HIVE-2206:
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Attachment: HIVE-2206.8-r1237253.patch.txt
@Kevin,
I wrongly assumed that all output names of the ReduceSinkOperator has a
structure of "KEY/VALUE.internalName". I have solved this issue.
However, the current optimizer cannot handel the case that a table is directly
connect to a post computation operator (in this case, table b directly connects
to the operator join). I am planning to solve this issue after this patch. To
walkaround, you can use ...
SET hive.optimize.reducededuplication=false;
SET hive.optimize.correlation=true;
SELECT * FROM (SELECT * FROM src DISTRIBUTE BY key SORT BY key) a JOIN (SELECT
* FROM src DISTRIBUTE BY key SORT BY key) b ON a.key = b.key;.
This query will be optimized and be executed in a single MapReduce job.
Also, I have updated the patch and it is compatible with revision 1237253.
> add a new optimizer for query correlation discovery and optimization
> --------------------------------------------------------------------
>
> Key: HIVE-2206
> URL: https://issues.apache.org/jira/browse/HIVE-2206
> Project: Hive
> Issue Type: New Feature
> Reporter: He Yongqiang
> Assignee: Yin Huai
> Attachments: HIVE-2206.1.patch.txt, HIVE-2206.2.patch.txt,
> HIVE-2206.3.patch.txt, HIVE-2206.4.patch.txt, HIVE-2206.5-1.patch.txt,
> HIVE-2206.5.patch.txt, HIVE-2206.6.patch.txt, HIVE-2206.7.patch.txt,
> HIVE-2206.8-r1237253.patch.txt, HIVE-2206.8.r1224646.patch.txt,
> YSmartPatchForHive.patch, testQueries.2.q
>
>
> reference:
> http://www.cse.ohio-state.edu/hpcs/WWW/HTML/publications/papers/TR-11-7.pdf
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