code: def _get_deleted_at_column(self, builder):
          
          if len(builder.get_query().joins) > 0:
              return builder.get_model().get_qualified_deleted_at_column()
          else:
              return builder.get_model().get_deleted_at_column()
docs: Get the "deleted at" column for the builder.
  
          :param builder: The query builder
          :type builder: orator.orm.builder.Builder
  
          :rtype: str