Github user JihongMA commented on the pull request:
https://github.com/apache/spark/pull/9380#issuecomment-153451606
so for skewness and kurtosis in case of count =1, we want to return null
instead of 0. I can address it, but instead of returning Double.NaN, should we
return null for stddev/variance when count = 0, null will be in line with all
other stats functions, like mix, max...
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