Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/10960#issuecomment-176315428
@davies Did you get a chance to test whole-stage codegen with higher-order
statistics like skewness? If it works, the cleanest solution would be changing
`CentralMomentAgg` to declarative and then make all existing univariate summary
statistics call it.
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