Another one in 8.1.7.2

 Automatic tuning = false
 Adaptive PQ = false

drop table j1;
  drop table j2;
  create table j1 ( c1 number );
  create table j2 ( c1 number );

  insert into j1 values (1); 
  insert into j1 values (1); 
  insert into j1 values (2 ); 

  insert into j2 values (3);
  insert into j2 values (3);
  commit;     

  select

     a.c1,a.s1,b.c1,b.s1
  from
(select --+ parallel(j1,10)

     c1,count(*) s1
   from j1
   group by c1) a,
(select --+ parallel(j2,10)

     c1,count(*) s1
   from j2
   group by c1) b
  where a.c1 = b.c1 (+);

  Here is the result:
  C1 S1 C1 S1
  1 2 [NULL] 2
  2 1 [NULL] 1
  Then remove the parallel hint:
  You get this:
  C1 S1 C1 S1
  1 2 [NULL] [NULL]
  2 1 [NULL] [NULL]

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Khedr, Waleed
  INET: Waleed.Khedr_at_FMR.COM

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