Github user hqzizania commented on the pull request:
https://github.com/apache/spark/pull/5446#issuecomment-99115759
Implement the describe() as DataFrame API. We could add this to the RDD API
in the future if we find a need. Thus, some functions also don't need to be
implemented like "histogram", "sampleStdev", "sampleVariance" now, since these
still don't exist in DataFrame API of spark.
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