[jira] [Commented] (SPARK-4485) Add broadcast outer join to optimize left outer join and right outer join

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14217687#comment-14217687 ] 

Apache Spark commented on SPARK-4485:
-------------------------------------

User 'wangxiaojing' has created a pull request for this issue:
https://github.com/apache/spark/pull/3362

> Add broadcast outer join to  optimize left outer join and right outer join
> --------------------------------------------------------------------------
>
>                 Key: SPARK-4485
>                 URL: https://issues.apache.org/jira/browse/SPARK-4485
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.1.0
>            Reporter: XiaoJing wang
>            Priority: Minor
>   Original Estimate: 0.05h
>  Remaining Estimate: 0.05h
>
> For now, spark use broadcast join instead of hash join to optimize {{inner join}} when the size of one side data did not reach the {{AUTO_BROADCASTJOIN_THRESHOLD}}
> However,Spark SQL will perform shuffle operations on each child relations while executing 
> {{left outer join}} and {{right outer join}}.   {outer join}} is more suitable for optimiztion with broadcast join. 
> We are planning to create a {{BroadcastHashouterJoin}} to implement the broadcast join for {{left outer join}} and {{right outer join}}



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