Github user davies commented on the pull request:
https://github.com/apache/spark/pull/12620#issuecomment-214147661
@njwhite We still use PickleSerializer to deserialize the functions, so it
means the serializer MUST be compatible with Pickle, I'm not sure make it
configurable will be really helpful (not a good API interface).
If you really want to hack it in your case, I think you could have many
ways to hack it in Python.
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