code: def get_required_columns(self):
          
          required_columns = []
          if self.formset_class:
              empty_form = self.get_formset().empty_form
              for column in self.columns.values():
                  field = empty_form.fields.get(column.name)
                  if field and field.required:
                      required_columns.append(column.name)
          return required_columns
docs: Lists names of columns that have required fields.