walterddr commented on issue #12217:
URL: https://github.com/apache/pinot/issues/12217#issuecomment-1879143299

   if the field is intended to be modified by user i think it is reasonable for 
the type change IMO
   
   b/c transform function are applied after upsert occurs (IIUC) this means if 
user wanted to convert a source field from the stream connector to a boolean 
type then write it into the upsert delete record column, it is not possible. 
   
   do we have any discussion regarding whether a derived field is transformed 
before or after upsert occurs?


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