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https://issues.apache.org/jira/browse/SPARK-13797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15188818#comment-15188818
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Apache Spark commented on SPARK-13797:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/11565
> Eliminate Unnecessary Window
> ----------------------------
>
> Key: SPARK-13797
> URL: https://issues.apache.org/jira/browse/SPARK-13797
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
>
> If the Window does not have any window expression, it is useless. It might
> happen after column pruning
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