danny0405 commented on pull request #12649:
URL: https://github.com/apache/flink/pull/12649#issuecomment-644612644


   > This is not possible in Calcite by default. Thats why we have the changes 
in 
`org.apache.calcite.rel.type.RelDataTypeFactoryImpl#createTypeWithNullability:326-338`.
   
   The calcite code says:
   
   > If nullable -> Do a deep copy, setting all fields of the record type
   > to be nullable regardless of initial nullability.
   
   This seems just what you need, what do you mean it is not possible ?


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