Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/18902
Eh, I meant that it may be possible to get the mean values purely using
DataFrame API. (convert missingValue/NaN to null) in one pass, so we may need
to check the performance comparison. But I guess it looks a little hack.
For the median value, it may be harder so we can use the RDD API. (to be
confirmed).
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