Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21648
I roughly double checked most of primitive types like Boolean, Long and
String work via Py4J, and some codes related with it in Py4J. Some types like
`Option[...]` will probably just return the Py4J object (via those private
helper methods like `isReplEagerEvalEnabled`).
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