Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/4314
I tried to improve the stability regarding nullable types. This should fix
FLINK-7177 and FLINK-7137. It ensures that all types have the correct
nullability. By default, types are always nullable. If they are not nullable,
than we know it for sure.
https://github.com/apache/flink/compare/master...twalthr:FLINK-7137
What do you think? @walterddr @fhueske
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