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https://issues.apache.org/jira/browse/SPARK-8759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609973#comment-14609973
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Apache Spark commented on SPARK-8759:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/7157
> add default eval to binary and unary expression according to default behavior
> of nullable
> -----------------------------------------------------------------------------------------
>
> Key: SPARK-8759
> URL: https://issues.apache.org/jira/browse/SPARK-8759
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Wenchen Fan
> Priority: Minor
>
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