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https://issues.apache.org/jira/browse/HIVE-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551625#comment-13551625
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Ashutosh Chauhan commented on HIVE-942:
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I think if BucketizedHiveInputFormat is used with map-side aggregation on, this
should already work, no? Probably reducer phase will also get created, which is
not required and can be optimized away. Is that the optimization we are talking
about?
> use bucketing for group by
> --------------------------
>
> Key: HIVE-942
> URL: https://issues.apache.org/jira/browse/HIVE-942
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
>
> Group by on a bucketed column can be completely performed on the mapper if
> the split can be adjusted to span the key boundary.
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