[jira] [Commented] (SPARK-12594) Outer Join Elimination by Filter Condition

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

    [ https://issues.apache.org/jira/browse/SPARK-12594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15080664#comment-15080664 ] 

Apache Spark commented on SPARK-12594:
--------------------------------------

User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10567

> Outer Join Elimination by Filter Condition
> ------------------------------------------
>
>                 Key: SPARK-12594
>                 URL: https://issues.apache.org/jira/browse/SPARK-12594
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.0
>            Reporter: Xiao Li
>            Priority: Critical
>
> Elimination of outer joins, if the predicates in the filter condition can restrict the result sets so that all null-supplying rows are eliminated. 
> - full outer -> inner if both sides have such predicates
> - left outer -> inner if the right side has such predicates
> - right outer -> inner if the left side has such predicates
> - full outer -> left outer if only the left side has such predicates
> - full outer -> right outer if only the right side has such predicates
> If applicable, this can greatly improve the performance. 



--
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