[SPARK-16391] KeyValueGroupedDataset.reduceGroups should support partial aggregation

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.1, 2.1.0
• Component/s: SQL
• Target Version/s: 2.0.1, 2.1.0
• Assignee: Reynold Xin
• Reporter: Reynold Xin
• Created: 06/Jul/16 06:19
• Updated: 18/Aug/16 08:40
• Resolved: 18/Aug/16 08:39

Description

KeyValueGroupedDataset.reduceGroups is currently implemented via flatMapGroups, which is very inefficient since effectively does a physical group by.

Issue Links

• links to: [Github] Pull Request #14222 (viirya)
• links to: [Github] Pull Request #14576 (rxin)