maosuhan commented on pull request #14376:
URL: https://github.com/apache/flink/pull/14376#issuecomment-802704116

   @libenchao Hi Benchao, very thanks for your review effort and it is a great 
appreciate that you give many detailed suggestions.
   I have fixed most of the issues and there's only 3 issues remaining that we 
should discuss.
   
   1. should we use the user classloader to init protobuf class?
   2. if flink row contains null value in complex type, shall we offer user a 
parameter to control whether the task should raise exception or fill in default 
values?  I'm okay with that.
   3. Regarding codegen framework, I'm trying to follow the way that flink 
itself does. Flink just concat piece of java codes together and I don't know if 
there's a better way to do this. I guess the main reason why the readability is 
not good is that java does not have text block function like scala has.


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