code: def _is_simple_query(cls, query):
          
          return (
              not query.low_mark
              and not query.high_mark
              and not query.select
              and not query.group_by
              and not query.distinct
              and not query.order_by
              and len(query.alias_map) <= 1
          )
docs: Inspect the internals of the Query and say if we think its WHERE clause
          can be used in a HANDLER statement