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https://issues.apache.org/jira/browse/SPARK-16391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-16391.
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Resolution: Fixed
Fix Version/s: 2.1.0
2.0.1
Issue resolved by pull request 14576
[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
> Fix For: 2.0.1, 2.1.0
>
>
> KeyValueGroupedDataset.reduceGroups is currently implemented via
> flatMapGroups, which is very inefficient since effectively does a physical
> group by.
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