INSERT into results_retepd 
select a.* , 'blahblah' as sessionid FROM shortest_path_astar
('SELECT gid AS id, source::int4, target::int4, 
length::double precision AS cost, length::double precision AS reverse_cost,x1,x2,y1,y2 FROM a_getpadova('||avoidztl_str||','||main_routing_str||') ',p_start, p_end, false, false) a ;