Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/9380#issuecomment-154164156
@JihongMA I don't know if there are any strong reasons in terms of
catalyst. However, personally I think we should separate changing the return
type and `null` from the issue. So, we should focus on refacotring stdev in
this PR. It seems that at least `Skewness` and `Kurtosis` have nothing to do
with the issue. If wee need to discuss them, it would be great to do in another
issue. Thanks.
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