Hi Sean, We're upgrading Mobius (C# binding for Spark) in Microsoft to align with Spark 1.6.2 and noticed some changes in API you did in
https://github.com/apache/spark/commit/6f81eae24f83df51a99d4bb2629dd7daadc01519 mostly on APIs with Approx postfix. (still marked as experimental in pyspark though) Can you help us understand how important these APIs are? (in C# we don't implement experimental APIs yet. We're not so sure whether we should or not) Thanks a lot, Renyi.
