Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21596
re: https://github.com/apache/spark/pull/21596#issuecomment-399639768
can we keep the previous behaviour although it's by kind of a bug in
Jackson? BTW, I thought we should use `NON_EMPTY` instead. Might be worth to
double check using `NON_ABSENT`.
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