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https://issues.apache.org/jira/browse/SPARK-17677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15524955#comment-15524955
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Apache Spark commented on SPARK-17677:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/15252

> Break WindowExec.scala into multiple files
> ------------------------------------------
>
>                 Key: SPARK-17677
>                 URL: https://issues.apache.org/jira/browse/SPARK-17677
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>
> As of Spark 2.0, all the window function execution code are in 
> WindowExec.scala. This file is pretty large (over 1k loc) and has a lot of 
> different abstractions in them. It would be more maintainable to break it 
> into multiple pieces.



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