public function countImpactedFunctions($delivery_id, Doctrine_Connection $conn = null)
 {
     $q = " \n            select count(distinct(t_id)) from ei_delivery_impacted_functions_vw   \n            where (s_delivery_id=" . $delivery_id . " or s2_delivery_id=" . $delivery_id . ")  \n             ";
     return $conn->fetchOne($q);
 }