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https://issues.apache.org/jira/browse/SPARK-2519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14063251#comment-14063251
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Sandy Ryza commented on SPARK-2519:
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https://github.com/apache/spark/pull/1435
> Eliminate pattern-matching on Tuple2 in performance-critical aggregation code
> -----------------------------------------------------------------------------
>
> Key: SPARK-2519
> URL: https://issues.apache.org/jira/browse/SPARK-2519
> Project: Spark
> Issue Type: Sub-task
> Components: Shuffle, Spark Core
> Reporter: Sandy Ryza
>
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