Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/9003#issuecomment-149365106
@sethah Besides inline comments, we can also think about how to simplify
the class inheritance. It would be better if we don't need to touch
`InternalRow` in subclasses. Also, `Variance` is the same as `VarianceSamp`,
shall we make one inherit another with a different `prettyName`?
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