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