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https://issues.apache.org/jira/browse/SPARK-7390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14529813#comment-14529813
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Apache Spark commented on SPARK-7390:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/5931
> CovarianceCounter in StatFunctions might calculate incorrect result
> -------------------------------------------------------------------
>
> Key: SPARK-7390
> URL: https://issues.apache.org/jira/browse/SPARK-7390
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> CovarianceCounter in StatFunctions has a merging stage. In this merge
> function, the other CovarianceCounter object sometimes has zero count that
> causes the final CovarianceCounter with incorrect result.
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