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https://issues.apache.org/jira/browse/SPARK-1926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008631#comment-14008631
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Takuya Ueshin commented on SPARK-1926:
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PRed: https://github.com/apache/spark/pull/881
> Nullability of Max/Min/First should be true.
> --------------------------------------------
>
> Key: SPARK-1926
> URL: https://issues.apache.org/jira/browse/SPARK-1926
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> Nullability of {{Max}}/{{Min}}/{{First}} should be {{true}} because they
> return {{null}} if there are no rows.
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