create or replace function find_parents_childs(obj_x VARCHAR2)
RETURN objects_below as parents objects_below;
begin
    select LPAD(' ', 3*level)||name
    bulk collect into parents
    from objects start  WITH object_id =  (SELECT object_id from objects
    where name = obj_x)
    CONNECT by prior parent_id = object_id;

    return parents;
end;

select find_parents_childs(name) from objects where name = 'Томас Шелби'