Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/8539#issuecomment-164730499
Yeah, this can't just exist in the Python API. It's not simplifying much,
since there's already a whole class to do the accumulation of sufficient
statistics; it's just a call to `combineByKey`. 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?
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