text: -- Check for routing point to point signatures
  SELECT exists(SELECT *
                FROM pg_proc p
                INNER JOIN pg_namespace ns ON (p.pronamespace = ns.oid)
                WHERE ns.nspname = 'cdb_dataservices_server'
                AND proname = 'cdb_route_point_to_point'
                AND oidvectortypes(p.proargtypes)  = 'text, text, geometry, geometry, text, text[], text');
  
  -- Check for routing waypoint route signatures
  SELECT exists(SELECT *
                FROM pg_proc p
                INNER JOIN pg_namespace ns ON (p.pronamespace = ns.oid)
                WHERE ns.nspname = 'cdb_dataservices_server'
                AND proname = 'cdb_route_with_waypoints'
                AND oidvectortypes(p.proargtypes)  = 'text, text, geometry[], text, text[], text');
  