Github user srowen commented on the issue:
https://github.com/apache/spark/pull/17503
It looks reasonable though I don't feel qualified to review it. I thought
the nodes had more than just the majority class - like the empirical
distribution at the node? That would make them not possible to combine in
general, but, I don't see that. However they do carry impurity info. Is that
going to be equal in enough cases to make the merge effective?
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