code: def erase_key_value(self):
          
          field_name = self.name
          new_df = copy_df(self)
          new_df._perform_operation(op.FieldKVConfigOperation({field_name: None}))
          return new_df
docs: Erase key-value represented fields.
  
          :rtype: Column
  
          :Example:
  
          >>> new_ds = df.erase_key_value('f1 f2')