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https://issues.apache.org/jira/browse/SPARK-12335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian updated SPARK-12335:
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Issue Type: Sub-task (was: Bug)
Parent: SPARK-12323
> CentralMomentAgg should be nullable
> -----------------------------------
>
> Key: SPARK-12335
> URL: https://issues.apache.org/jira/browse/SPARK-12335
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.6.0, 2.0.0
> Reporter: Cheng Lian
> Assignee: Apache Spark
>
> According to the {{getStatistics}} method overriden in all its subclasses,
> {{CentralMomentAgg}} should be nullable.
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