Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2093
For the tests, I think you need to compare the expected results to the
actual results the same way the existing tests do it, via exact comparison. As
you put it now, it would allow that all actual results are the same value
because the tests don't verify that we see all expected values, just that the
size of the result list matches.
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