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https://issues.apache.org/jira/browse/SPARK-9634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14697731#comment-14697731
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Apache Spark commented on SPARK-9634:
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User 'marmbrus' has created a pull request for this issue:
https://github.com/apache/spark/pull/8215
> cleanup unnecessary Aliases in LogicalPlan at the end of analysis
> -----------------------------------------------------------------
>
> Key: SPARK-9634
> URL: https://issues.apache.org/jira/browse/SPARK-9634
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Wenchen Fan
>
> Also alias the ExtractValue instead of wrapping it with UnresolvedAlias when
> resolve attribute in LogicalPlan, as this alias will be trimmed if it's
> unnecessary.
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