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https://issues.apache.org/jira/browse/HIVE-1695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966044#action_12966044
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Sreekanth Ramakrishnan commented on HIVE-1695:
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The initial thought of mine was to change the processing of MapJoin followed by
select operator. But there was comment in MapJoinFactory class which stated
that, while walking down the node stack, we only process the current element or
its parent and leave children process to the child processor code.
Is it ok to remove the MapJoin%Sel and change the processing in MapJoin%RS to
make it clearer?
I have handled the group by case, Will be attaching how the Plan look like in
next comment.
> MapJoin followed by ReduceSink should be done as single MapReduce Job
> ---------------------------------------------------------------------
>
> Key: HIVE-1695
> URL: https://issues.apache.org/jira/browse/HIVE-1695
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Amareshwari Sriramadasu
>
> Currently MapJoin followed by ReduceSink runs as two MapReduce jobs : One map
> only job followed by a Map-Reduce job. It can be combined into single
> MapReduce Job.
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