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https://issues.apache.org/jira/browse/SPARK-13903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194994#comment-15194994
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Apache Spark commented on SPARK-13903:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/11722
> Modify output nullability with constraints for Join operator
> ------------------------------------------------------------
>
> Key: SPARK-13903
> URL: https://issues.apache.org/jira/browse/SPARK-13903
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> With constraints and optimization, we can make sure some outputs of a Join
> operator are not nulls. We should modify output nullability accordingly. We
> can use this information in later execution to avoid null checking.
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