Xuefu Zhang created HIVE-9045:
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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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