Github user srowen commented on the issue:
https://github.com/apache/spark/pull/22759
@dima-asana it looks like this was on purpose:
https://github.com/apache/spark/commit/2f38378856fb56bdd9be7ccedf56427e81701f4e
CC @gatorsmile
I agree though, doesn't appear that it's actually forced to be nullable on
write.
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