code: def expanded_transform(self):
          
  
          segments = self._expand_transform(self.transform)
  
          if segments:
  
              segments[0]['datatype'] = self.valuetype_class
  
              for s in segments:
                  s['column'] = self
  
          else:
  
              segments = [self.make_xform_seg(datatype=self.valuetype_class, column=self)]
  
          # If we want to add the find datatype cast to a transform.
          #segments.append(self.make_xform_seg(transforms=["cast_"+self.datatype], column=self))
  
          return segments
docs: Expands the transform string into segments