Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/2047#issuecomment-222532431
close() is called by all operators when the operator finishes without an
exception of canceling. Have a look at the AbstractUDFStream
Stop() is thought to be merely a trigger to make an unbounded source stop
its unbounded loop. After that, it should finish like a bounded source,
including the close() call.
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