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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-9045) Choosing right preference between map join and bucket map join [Spark Branch]
Date Tue, 09 Dec 2014 00:11:12 GMT
Xuefu Zhang created HIVE-9045:
---------------------------------

             Summary: Choosing right preference between map join and bucket map join [Spark
Branch]
                 Key: HIVE-9045
                 URL: https://issues.apache.org/jira/browse/HIVE-9045
             Project: Hive
          Issue Type: Sub-task
          Components: Spark
            Reporter: Xuefu Zhang


Currently We convert a join to bucket map join only after it's converted to map join. Supposedly,
however, bucket map join has a smaller memory print, so a join which doesn't fit to map join
might be suitable for a bucket map join. It would be good if we can take this into consideration
when applying join optimizations.



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