Github user sethah commented on the pull request:
https://github.com/apache/spark/pull/9003#issuecomment-149424324
@mengxr I think having `VarianceSamp` inherit from `Variance` will be a
fine solution. I'm not clear on why it is better not to touch `InternalRow` in
the subclasses, but if we must avoid it, one solution could be
```scala
def eval(buffer: InternalRow): Any = this match {
case _: VariancePop => { }
case _: Variance => { }
case _: Skewness => { }
case _: Kurtosis => { }
```
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