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https://issues.apache.org/jira/browse/SPARK-7452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533514#comment-14533514
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Apache Spark commented on SPARK-7452:
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User 'coderxiang' has created a pull request for this issue:
https://github.com/apache/spark/pull/5990
> need to sort when convert to array in topByKey
> ----------------------------------------------
>
> Key: SPARK-7452
> URL: https://issues.apache.org/jira/browse/SPARK-7452
> Project: Spark
> Issue Type: Bug
> Reporter: Shuo Xiang
>
> the toArray function of the PriorityQueue does not necessarily preserve
> order. Add a counter-example as the test, which would fail the original impl.
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