Github user walterddr commented on the issue:
https://github.com/apache/flink/pull/4314
@twalthr Thank you for the suggestion, yeah I think this nullable default
to false issue will pop up soon somewhere else, might as well just resolve them
all together. I incorporated your suggestions and also add some tests so that
the problem could be captured during unitest instead of ITCases. Let me know
what your thoughts on this are @fhueske @twalthr
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