Github user erikerlandson commented on the issue:
https://github.com/apache/spark/pull/13440
I think targeting 3.0 with a refactor makes the most sense. There's no way
to do this without making small breaking changes, but slightly larger changes
could clean up the design. `ImpurityCalculator` can subsume `Impurity`, and a
more general rethinking of gain and impurity can be accommodated too.
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