Reynold Xin created SPARK-16391:
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Summary: 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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