What wrong? (INSERT) PARALLEL hint - It not compress

I saw some post about (INSERT) parallel hint not work with "compress for query high " on communities.oracle.com, So I tested it...
*** Oracle 11.2.0.2 and Image version: 11.2.2.2.0.101206.2 ***
On table no compress:

SQL> create table tb_a tablespace TBS_TEST_EXA as select * from dba_objects where 1=0;

Table created.

SQL> insert /*+ parallel */ into tb_a t select * from dba_objects;

17808 rows created.

SQL> select sum(g.bytes / 1024) sum,
g.segment_name,
g.tablespace_name
from dba_segments g
where g.segment_name = 'TB_A'
group by tablespace_name, segment_name;

SUM SEGMENT_NAME TABLESPACE_NAME
---------- --------------------------------------------------------------------------------- ------------------------------
2048 TB_A TBS_TEST_EXA

On compress for query high:

SQL> create table tb_b tablespace TBS_TEST_EXA compress for query high as select * from dba_objects where 1=0;

Table created.

Case A: Use PARALLEL hint

SQL> ALTER session SET EVENTS '10046 trace name context forever, level 12';
SQL> insert /*+ parallel(t) */ into tb_b t select * from dba_objects;
SQL> ALTER session SET EVENTS '10046 trace name context off';

In trace file: I don't see about compression. just see:

WAIT #47502448530384: nam='asynch descriptor resize' ela= 2 outstanding #aio=0 current aio limit=219 new aio limit=154 obj#=19 tim=1313001654410274
EXEC #47502448530384:c=101984,e=113787,p=0,cr=1579,cu=2514,mis=0,r=17807,dep=0,og=1,plh=3173891493,tim=1313001654410582
STAT #47502448530384 id=1 cnt=0 pid=0 pos=1 obj=0 op='LOAD TABLE CONVENTIONAL (cr=1579 pr=0 pw=0 time=113756 us)'

Check segment size:

SQL> select sum(g.bytes / 1024) sum,
g.segment_name,
g.tablespace_name
from dba_segments g
where g.segment_name = 'TB_B'
group by tablespace_name, segment_name;

SUM SEGMENT_NAME TABLESPACE_NAME
---------- --------------------------------------------------------------------------------- ------------------------------
2048 TB_B TBS_TEST_EXA

Case B: Use APPEND hint

SQL> ALTER session SET EVENTS '10046 trace name context forever, level 12';
SQL> insert /*+ append */ into tb_b t select * from dba_objects;
SQL> ALTER session SET EVENTS '10046 trace name context off';

In trace file:

PARSING IN CURSOR #47502447102008 len=198 dep=1 uid=0 oct=3 lid=0 tim=1313001730563910 hv=2190895844 ad='da3536290' sqlid='b91n32219cur4'
select ilevel, bestsortcol, tinsize, toutsize, analyzer from (select * from compression$ where obj#=:1 and ulevel=:2 order by mtime desc) where rownum < 2
END OF STMT

WAIT #47502448530384: nam='asynch descriptor resize' ela= 1 outstanding #aio=0 current aio limit=223 new aio limit=158 obj#=19 tim=1313001730671372
WAIT #47502448530384: nam='direct path write' ela= 380 file number=530 first dba=642 block cnt=15 obj#=19 tim=1313001730683122
EXEC #47502448530384:c=118983,e=121768,p=0,cr=781,cu=55,mis=0,r=17807,dep=0,og=1,plh=332911567,tim=1313001730683230
STAT #47502448530384 id=1 cnt=0 pid=0 pos=1 obj=0 op='LOAD AS SELECT (cr=781 pr=0 pw=15 time=121705 us)'

Check segment size:

SQL> select sum(g.bytes / 1024) sum,
g.segment_name,
g.tablespace_name
from dba_segments g
where g.segment_name = 'TB_B'
group by tablespace_name, segment_name;

SUM SEGMENT_NAME TABLESPACE_NAME
---------- --------------------------------------------------------------------------------- ------------------------------
192 TB_B TBS_TEST_EXA

Oops! What wrong?