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https://issues.apache.org/jira/browse/SPARK-16391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15414752#comment-15414752
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Apache Spark commented on SPARK-16391:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/14576
> KeyValueGroupedDataset.reduceGroups should support partial aggregation
> ----------------------------------------------------------------------
>
> Key: SPARK-16391
> URL: https://issues.apache.org/jira/browse/SPARK-16391
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
>
> KeyValueGroupedDataset.reduceGroups is currently implemented via
> flatMapGroups, which is very inefficient since effectively does a physical
> group by.
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