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https://issues.apache.org/jira/browse/HIVE-3655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amareshwari Sriramadasu resolved HIVE-3655.
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Resolution: Won't Fix
> Use ChainMapper and ChainReducer for queries having [Map+][RMap*] pattern
> -------------------------------------------------------------------------
>
> Key: HIVE-3655
> URL: https://issues.apache.org/jira/browse/HIVE-3655
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Amareshwari Sriramadasu
>
> While breaking the query plan into multiple map reduce tasks, Hive should
> consider the pattern [Map+][ReduceMap*] and generate single map reduce job
> for such patterns using ChainMapper and ChainReducer
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