code: def _query_select_options(self, query, select_columns=None):
          
          if select_columns:
              _load_options = list()
              for column in select_columns:
                  if "." in column:
                      model_relation = self.get_related_model(column.split(".")[0])
                      if not self.is_model_already_joinded(query, model_relation):
                          query = query.join(model_relation)
                      _load_options.append(
                          Load(model_relation).load_only(column.split(".")[1])
                      )
                  else:
                      if not self.is_relation(column) and not hasattr(
                          getattr(self.obj, column), "__call__"
                      ):
                          _load_options.append(Load(self.obj).load_only(column))
                      else:
                          _load_options.append(Load(self.obj))
              query = query.options(*tuple(_load_options))
          return query
docs: Add select load options to query. The goal
              is to only SQL select what is requested
  
          :param query: SQLAlchemy Query obj
          :param select_columns: (list) of columns
          :return: SQLAlchemy Query obj