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Kevin Wilfong commented on HIVE-942: ------------------------------------ If the table is bucketed and sorted on the group by keys, the group by operator would not need to do a hash, which would help with memory consumption. > use bucketing for group by > -------------------------- > > Key: HIVE-942 > URL: https://issues.apache.org/jira/browse/HIVE-942 > Project: Hive > Issue Type: New Feature > Components: Query Processor > Reporter: Namit Jain > > Group by on a bucketed column can be completely performed on the mapper if > the split can be adjusted to span the key boundary. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira