Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/12426#issuecomment-212037703
@mengxr Regarding function serialization there is a subsection in
https://docs.google.com/document/d/1oegI3OjmK_a-ME4m7sdL4ZlzY7wkXzfaX69GqQqK0VI/edit#heading=h.ei763k8tkz8o
that discusses what we assume at a high level. I think that might useful to
add in the documentation (See also the notes about some known issues / bugs)
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