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https://issues.apache.org/jira/browse/SPARK-14851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288103#comment-15288103
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Apache Spark commented on SPARK-14851:
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User 'ericl' has created a pull request for this issue:
https://github.com/apache/spark/pull/13161
> Support radix sort with nullable longs
> --------------------------------------
>
> Key: SPARK-14851
> URL: https://issues.apache.org/jira/browse/SPARK-14851
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Eric Liang
>
> The current radix sort cannot handle nullable longs, since there is no bit
> pattern available to represents nulls. These cases are probably best handled
> outside the radix sort logic e.g. by keeping nulls in a separate region of
> the array.
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