Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/13335#issuecomment-222415048
I reverted
https://github.com/apache/spark/commit/c24b6b679c3efa053f7de19be73eb36dc70d9930
as there is a Option serialization bug in jackson-module-scala 2.7.3
(https://github.com/FasterXML/jackson-module-scala/issues/240)
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