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

["XiaoJing wang (JIRA)" <ji...@apache.org>]

XiaoJing wang created SPARK-4485:
------------------------------------

             Summary: 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


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-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org