Github user zjureel commented on the issue:
https://github.com/apache/flink/pull/4277
@StephanEwen @tillrohrmann As discussed in
https://github.com/apache/flink/pull/4220, I create this PR to fix issue
[FLINK-6667](https://issues.apache.org/jira/browse/FLINK-6667). Could you
please have a look when you're free, thanks :)
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