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Posted to dev@hive.apache.org by "Na Yang (JIRA)" <ji...@apache.org> on 2014/10/28 22:48:33 UTC
[jira] [Updated] (HIVE-8638) Implement bucket map join optimization
[Spark Branch]
[ https://issues.apache.org/jira/browse/HIVE-8638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Na Yang updated HIVE-8638:
--------------------------
Issue Type: Sub-task (was: Task)
Parent: HIVE-7292
> 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: 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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