Github user greghogan commented on the issue: https://github.com/apache/flink/pull/4525 As I understand Flink does not allow `null` records since what does it mean to partition or window a null record? `null` fields are sometimes allowed but `null` records are meaningless. The caller of `InputFormat#nextRecord` cannot reuse an object which has already been passed to `nextRecord` as a reusable object as this may result in an object being "used" twice. That's why object reuse always replaces the passed object with the returned object, which may be the same but could be different. @kl0u could you offer some insight into FLINK-4075 adding the null check with break to `InputFormatSourceFunction#run`? Thanks.
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