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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