[ 
https://issues.apache.org/jira/browse/SPARK-4485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Apache Spark reassigned SPARK-4485:
-----------------------------------

    Assignee: Kai Zeng  (was: Apache Spark)

> 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
>            Assignee: Kai Zeng
>            Priority: Critical
>   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}}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org

Reply via email to