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https://issues.apache.org/jira/browse/SPARK-11489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-11489.
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Resolution: Fixed
Fix Version/s: 1.6.0
> Only include common first order statistics in GroupedData
> ---------------------------------------------------------
>
> Key: SPARK-11489
> URL: https://issues.apache.org/jira/browse/SPARK-11489
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Fix For: 1.6.0
>
>
> We added a bunch of higher order statistics such as skewness and kurtosis to
> GroupedData. I don't think they are common enough to justify being listed,
> since users can always use the normal statistics aggregate functions.
> That is to say, after this change, we won't support
> df.groupBy("key").kurtosis("colA", "colB")
> However, we will still support
> df.groupBy("key").agg(kurtosis("colA"), kurtosis("colB"))
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