Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16193
It's a little hacky to me that we do optimization in a planner. How hard is
it if we introduce a logical node for python evaluator? We can define an
interface in catalyst, e.g. `ExternalUDFEvaluator`, so that R(or other
languages in the future) UDF can also benefit from it.
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