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https://issues.apache.org/jira/browse/SPARK-11720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-11720:
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Assignee: (was: Apache Spark)
> Return Double.NaN instead of null for Mean and Average when count = 0
> ---------------------------------------------------------------------
>
> Key: SPARK-11720
> URL: https://issues.apache.org/jira/browse/SPARK-11720
> Project: Spark
> Issue Type: Sub-task
> Reporter: Jihong MA
> Priority: Minor
>
> change the default behavior of mean in case of count = 0 from null to
> Double.NaN, to make it inline with all other univariate stats function.
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