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https://issues.apache.org/jira/browse/SPARK-11088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14955765#comment-14955765
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Apache Spark commented on SPARK-11088:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/9104
> Optimize DataSourceStrategy.mergeWithPartitionValues
> ----------------------------------------------------
>
> Key: SPARK-11088
> URL: https://issues.apache.org/jira/browse/SPARK-11088
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.1, 1.5.1
> Reporter: Cheng Lian
> Assignee: Cheng Lian
>
> This method is essentially a projection, but it's implemented in an pretty
> inefficient way and causes significant boxing cost.
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