[Hive] map-side aggregation should be automatically disabled at run-time if it is not turning out to be useful --------------------------------------------------------------------------------------------------------------
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 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.