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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-12594) Join Conversion: Outer to Inner/Left/Right, Right to Inner and Left to Inner
Date Fri, 01 Jan 2016 00:29:39 GMT

    [ https://issues.apache.org/jira/browse/SPARK-12594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076200#comment-15076200
] 

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

User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/10542

> Join Conversion: Outer to Inner/Left/Right, Right to Inner and Left to Inner
> ----------------------------------------------------------------------------
>
>                 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
>
> Conversion of outer joins, if the local predicates can restrict the result sets so that
all null-supplying rows are eliminated. 
> - full outer -> inner if both sides have such local predicates
> - left outer -> inner if the right side has such local predicates
> - right outer -> inner if the left side has such local predicates
> - full outer -> left outer if only the left side has such local predicates
> - full outer -> right outer if only the right side has such local predicates
> If applicable, this can greatly improve the performance. 



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