Na Yang created HIVE-8638:
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Summary: Implement bucket map join optimization [Spark Branch]
Key: HIVE-8638
URL: https://issues.apache.org/jira/browse/HIVE-8638
Project: Hive
Issue Type: Task
Components: Spark
Reporter: Na Yang
Assignee: Na Yang
In the hive-on-mr implementation, bucket map join optimization has to depend on
the map join hint. While in the hive-on-tez implementation, a join can be
automatically converted to bucket map join if certain conditions are met such
as:
1. the optimization flag hive.convert.join.bucket.mapjoin.tez is ON
2. all join tables are buckets and each small table's bucket number can be
divided by big table's bucket number
3. bucket columns == join columns
In the hive-on-spark implementation, it is ideal to have the bucket map join
auto-convertion support. when all the required criteria are met, a join can be
automatically converted to a bucket map join.
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