Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/9380#issuecomment-156247920
LGTM. Merged into master and branch-1.6. Thanks! Btw, there is a minor
style issue I marked inline. @JihongMA Could you submit another PR to change
the output of `mean([])` to `NaN` from `null`?
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