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https://issues.apache.org/jira/browse/SPARK-7979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14566387#comment-14566387
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Apache Spark commented on SPARK-7979:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/6536
> Enforce structural type checker
> -------------------------------
>
> Key: SPARK-7979
> URL: https://issues.apache.org/jira/browse/SPARK-7979
> Project: Spark
> Issue Type: Sub-task
> Components: Project Infra
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> Structural types in Scala can use reflection - this can have unexpected
> performance consequences.
> See
> http://www.scalastyle.org/rules-0.7.0.html#org_scalastyle_scalariform_StructuralTypeChecker
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