Github user fhueske commented on the issue:

    https://github.com/apache/flink/pull/5415
  
    Thanks for the question @zentol. That might be a cleaner solution, but I 
don't think we could move much into the shared super class. Everything that's 
not `private` would need to be duplicated to maintain binary compatibility. 
However, most method are `protected` or `private`. 


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