[jira] [Resolved] (SPARK-11489) Only include common first order statistics in GroupedData

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-11489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin resolved SPARK-11489.
---------------------------------
       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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