Github user XuPingyong commented on the issue:
https://github.com/apache/flink/pull/4525
Thanks @StephanEwen , so I think `null` values can be returned from
`InputFormat#nextRecord` anytime, even not end.
Can `null` values be passed to `InputFormat#nextRecord`, or checkNull(if
`null`, give a new object) before passed?
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