Github user cowtowncoder commented on the pull request:
https://github.com/apache/spark/pull/12213#issuecomment-206672520
@JoshRosen probably makes sense, but just in case it needs to be revisited
Jackson's core databind has much more support for "referential types" (which
includes `Option`/`Optional`) as of 2.7, and supporting it should be much
simpler with basic (de)serializer like one used for `AtomicReference`. I can
help more if/when this is needed; for now I just mention it as
forward-reference. I will actually need to work with @nbauernfeind (maintainer
of Jackson Scala module) to ensure Scala module 2.7 is fully up-to-date with
this part of type handling; earlier it required much more explicit work by
module.
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