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https://issues.apache.org/jira/browse/HIVE-8638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jimmy Xiang updated HIVE-8638:
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Attachment: (was: HIVE-8638.1-spark.patch)
> Implement bucket map join optimization [Spark Branch]
> -----------------------------------------------------
>
> Key: HIVE-8638
> URL: https://issues.apache.org/jira/browse/HIVE-8638
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Na Yang
> Assignee: Jimmy Xiang
>
> 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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