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https://issues.apache.org/jira/browse/SPARK-10291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15064266#comment-15064266
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Sean Owen commented on SPARK-10291:
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My POV is that this isn't likely worth adding a method for. I appreciate the
value of utility methods but have to weight it against adding another item to a
core API and how often it'd be used. This is also straightforward to express in
Spark SQL on a dataframe, no?
> Add statsByKey method to compute StatCounters for each key in an RDD
> --------------------------------------------------------------------
>
> Key: SPARK-10291
> URL: https://issues.apache.org/jira/browse/SPARK-10291
> Project: Spark
> Issue Type: New Feature
> Components: PySpark
> Reporter: Erik Shilts
> Priority: Minor
>
> A common task is to summarize numerical data for different groups. Having a
> `statsByKey` method would simplify this so the user would not have to write
> the aggregators for all the statistics or manage collecting by key and
> computing individual StatCounters.
> This should be a straightforward addition to PySpark. I can look into adding
> to Scala and R if we want to maintain feature parity.
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