select语里里的function的读一致性问题

[sql] 
drop table test;  
/  
create table test as select 1 as t1 from dual  
/  
create or replace function f_test return number  
  --deterministic  
  as  
  v_t1   test.t1%type;  
  v_date date;  
begin  
  v_date := sysdate + 1 / 24 / 60 / 60;  
  for i in 1 .. 1000000 loop  
    exit when sysdate >= v_date;  
    for j in 1 .. 1000000 loop  
      exit when sysdate >= v_date;  
      for k in 1 .. 1000 loop  
        exit when sysdate >= v_date;  
      end loop;  
    end loop;  
  end loop;  
  select t1 into v_t1 from test where rownum <= 1;  
  return v_t1;  
end;  
/  
--session1:  
begin  
  loop  
    dbms_lock.sleep(1);  
    update test set t1 = t1 + 1;  
    commit;  
  end loop;  
end;  
/  
--session2:  
select f_test as fun_t1,t1 from test connect by level <= 10;  
SQL>





 select f_test as fun_t1,t1 from test connect by level <= 10;  
   
    FUN_T1         T1  
---------- ----------  
         5          4  
         6          4  
         7          4  
         8          4  
         9          4  
        10          4  
        11          4  
        12          4  
        13          4  
        14          4  
   
10 rows selected