zicat commented on pull request #16163:
URL: https://github.com/apache/flink/pull/16163#issuecomment-874486894


   > Hi @zicat What do you think about the `copy` method?
   
   Override copy method is the simplest way for this issue. Exactly It's 
dangerous when Copy the field of resultType because that maybe cause 
this.dataType.getLogicalType != super.resultType, So I reinforce the copy 
method. Copy the other fields is safe I think. Looking forward to your reply. 


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