Github user XuPingyong commented on the issue:
https://github.com/apache/flink/pull/4525
Thanks @greghogan.
I think the InputFormat can return anything, may be null or other
immutable objects that cannot be passed to nextRecord.
And I am also not clear why the object passed to nextRecord may be
reused internally by the InputFormat. The param of nextRecord named reuse means
it may be re-passed to this call again?
What do you think?
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