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https://issues.apache.org/jira/browse/SPARK-12604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15087139#comment-15087139
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Apache Spark commented on SPARK-12604:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/10641
> Java count(AprroxDistinct)ByKey methods return Scala Long not Java
> ------------------------------------------------------------------
>
> Key: SPARK-12604
> URL: https://issues.apache.org/jira/browse/SPARK-12604
> Project: Spark
> Issue Type: Sub-task
> Components: Java API, Spark Core
> Affects Versions: 1.6.0
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
> Labels: releasenotes
> Fix For: 2.0.0
>
>
> Another minor API problem I noticed while digging around. The following Java
> API methods return a Long as part of their signature, but it's a
> {{scala.Long}}, not a {{java.lang.Long}}:
> * countByKey
> * countApproxDistinctByKey
> Other similar methods correctly return a Java Long, like countByValue, and
> the whole Java streaming API.
> Of course, changing this is probably the right thing to do, but also is an
> API change. I think it's worth fixing up
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