Hierchical wth null and holes

I am trying to mine the DBA_HIST_ACTIVE_SESS_HISTORY. The column that interrest me are 'sample_time','session_sid','session_serial#', 'blocking_session' and blocking_Session_serial#'.
The purpose is to list per sample time the blocking session tree (and related data here out of scope).
When the blocking last several minutes, all blocked session are sampled and the data is rather relevant
for troubleshooting, thought not absolute. But the data model is not easy for you may have holes.
I have reproduced a simplified version of the data pattern as
it is in DBA_HIST_ACTIVE_SESS_HISTORY and what I want to achieve.
-- grp stands for time_sample and it is the base grouping
-- sid stands for session
-- bsid stands for blocking session, this is a column of the SID row
--         but reference the same type of object (session).
--         bsid itself may be present (or not) as a row.
-- We don't consider the serial in this simplified model
create table hist_table ( grp varchar2(1) , sid number, bsid number ) ;
insert into hist_table values ( 'A', 10, 100 ) ;
insert into hist_table values ( 'A', 20 , null ) ;
insert into hist_table values ( 'A', 30, 40 ) ;
insert into hist_table values ( 'A', 40, 50 ) ;
insert into hist_table values ('A', 50, null ) ;
insert into hist_table values ( 'B', 10, 100 ) ;
insert into hist_table values ( 'B',20 , null ) ;
SQL> select * from hist_table ;
G        SID       BSID
A         10        100
A         20
A         30         40
A         40         50
A         50
B         10        100
B         20
We want :
grp Session
A    10
A        100
A    20
A    30
A       40
A         50
B   10
B       100
B   20
-- The difficulty is that blocking session 100 has no dedicated row.
-- Session 20 has no blocking session.
-- Sessions 30,40,50 are all linked in a hierarchic pattern.

Here is my work derieved on above answers. thanks to all who devoted time and helped me.
Bernard Polarski
http://www.smenu.org
set lines 190 page 82
col user_id head 'Usr|id' format 999
col event head 'Event' format a30
col usr_sqlid format a35
col fsid for a14 head 'Sid'
col sid_sql for a35 head 'Session sql text'
col bser for 99999 head 'Block|sess|serl#'
col ser for 99999 head 'Serl#'
col file# for 999 head 'Fl#'
col block# for 9999999 head 'block#'
col obj# for 999999 head 'obj#'
col sample_time for a8 head 'Time'
break on instance_number on sample_time on report
col wait_time for 9990.00 head 'Prev |wait| time(s)' justify c
prompt Prev wait : any value > 0 means SQL currently running on CPU, numeric refer to wait(secs) before this run
prompt
with fview as (
    select
           blocking_session as session_id, blocking_SESSION_SERIAL# as SESSION_SERIAL# ,
           -1 as blocking_session, -1 as blocking_SESSION_SERIAL#,
           null sql_id, null event , sample_time, null obj# , null file# ,
           null block# , null wait_time, null user_id, null instance_number
    from DBA_HIST_ACTIVE_SESS_HISTORY a
         where 1=1 and snap_id = '5884'   and dbid= '810902110' and blocking_session is not null
            and not exists (select null
                                   from DBA_HIST_ACTIVE_SESS_HISTORY
                             where
                                    session_id=a.blocking_session
                              and   session_serial#=a.blocking_session_serial# and snap_id = '5884'   and dbid= '810902110'
                              and   snap_id=a.snap_id
                              and   dbid=a.dbid
   union
   select
         session_id, SESSION_SERIAL#, blocking_session, blocking_session_serial#,
         sql_id, event, sample_time, CURRENT_OBJ# obj#, CURRENT_FILE# file#,
         CURRENT_BLOCK# block#, wait_time/100 wait_time, user_id, instance_number
   from DBA_HIST_ACTIVE_SESS_HISTORY a
        where 1=1 and snap_id = '5884'   and dbid= '810902110'
select
       a.instance_number, to_char(a.sample_time,'HH24:MI:SS') sample_time,
       lpad(' ', 2*level)||session_id fsid,
       SESSION_SERIAL# ser, user_id, a.sql_id,
       decode(a.wait_time,0,' -wait-', to_char(wait_time,'99990.00')) wait_time,
       event , a.file#, a.obj#, block#, substr(t.sql_text,1,35) sid_sql --, blocking_session
from   ( select
                  instance_number, sample_time,
                  session_id, SESSION_SERIAL# , sql_id, event, obj#, file#, block#,
                  wait_time, user_id, blocking_session, blocking_SESSION_SERIAL#
           from fview a
           start with not exists (select 1
                                  from
                                     fview b
                                  where
                                          b.sample_time            = a.sample_time
                                     and b.blocking_session       = a.session_id
                                     and blocking_session_serial# = a.SESSION_SERIAL# )
          connect by prior sample_time              = sample_time
                      and   prior blocking_session         = session_id
                      and   prior blocking_SESSION_SERIAL# = SESSION_SERIAL#
          )a,
          dba_hist_sqltext t
    where
          t.sql_id (+) = a.sql_id
          connect by nocycle
                           prior session_id = blocking_session
                         and   prior session_serial# = blocking_session_serial#
                         and sample_time= prior sample_time
                                                         Prev
In                                  Usr                 wait
st Time     Sid             Serl#   id SQL_ID         time(s) Event                           Fl#    obj#   block# Session sql text
2 09:00:01   1478          45824   48 fph5dfjrr6spu      2.78                                  58   77692   150780 SELECT bf.bf_id, bf.status, bs.sho
               1482          34169   48 6gpfyfz414w80      2.44                                  53   78348   713894 select field1 from ( SELECT field1
1 09:00:03   1519          12157   93 96swh01bpcv54 -wait-   gc cr multi block request        58   77692    13920 SELECT COUNT (O.BF_ID) FROM IBS6_EB
               1515          29566    0                -wait-   log switch/archive                0      -1        0
2 09:00:11   1482          34169   48 4ks1swd743v6h -wait-   db file sequential read          52   77987   294036 INSERT into SUMMTRANSACTIONLVL(SUMM
1 09:00:13   1549          25308    0 fjtb8ybf2g817 -wait-   control file sequential read      0      -1        0 select nvl(max(cpmid),0) from x$kcc
               1600          15870   48 07x2k1s911cs1      2.69                                  52   78010   837991 SELECT bf.bf_id, bf.status, bs.sho
    09:00:23   1519          12157   93 96swh01bpcv54 -wait-   gc cr multi block request        52   77692   165451 SELECT COUNT (O.BF_ID) FROM IBS6_EB
               1550          18167   48 69u51auyg39c0      0.01                                  44   77975    14854 select count(1) from r4rrequest r,
2 09:00:31   1518          30594    0                -wait-   db file sequential read           0      -1        0
1 09:00:33   1563           7961    0                -wait-   enq: WF - contention              0      -1        0
2 09:01:11   1478          45824   48 0wva63ycbrqxn      0.02                                   0      -1        0 SELECT cp.counterparty_id, cp.updat
1 09:01:14   1584          55897   48 dj4vc1pdbvy98 -wait-   db file sequential read          49   78106   224094 select unique eb1.bankcustomer_id,
               1655              1    0                29279.20                                   0      -1        0
2 09:01:31   1604           3421   48 cdg898bazxj0t      0.01                                  47   77994   154271    SELECT unique ucp.USERCONTRACTPROF
    09:01:42   1508          28278   48 fgacpsh4cctb0 -wait-   gc current block busy            49   78367   258887 INSERT into USERMESSAGE(USERMESSAGE
               1480          14992   48 25wncxupku5ty      0.01                                   5   78021    28828 SELECT        aubu.ebuser_id FROM
                 1617        62553   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1615        18792   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1613         6428   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1609        18013   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1579        37687   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1572         4128   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1520        59235   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1501        20868   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1478        45824   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1482        34169   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1507         4886   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1566        39358   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1578        20585   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1597        48687   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1603        48768   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri
                 1604         3421   48 0g7y44z6btjh0 -wait-   enq: TX - row lock contention     5   78021    28828 update usermessagepkiuser set useri

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Whether you do any of the following code, the JUnit Test always passes: I mean he NOT Sign doesnt make a difference ...
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