[Hive] map-side aggregation should be automatically disabled at run-time if it
is not turning out to be useful
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Key: HIVE-291
URL: https://issues.apache.org/jira/browse/HIVE-291
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Reporter: Namit Jain
Assignee: Namit Jain
Map-side aggregation should be automatically disabled at run-time if it is not
turning out to be useful.
If map-side aggregation is not reducing the number of output rows, it is a
drain on the mapper, since it is consuming memory and performing unnecessary
hash lookups
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