Oracle: Execution plan for an UNPIVOT query

create table tq84_tab(
  col_1    integer,
  col_2    varchar2(5),
  val_foo  number(4,1),
  val_bar  number(4,1),
  val_baz  number(4,1)
);

insert into tq84_tab values ( 1 , 'abc' , 5.1 , 72.6 , 530.6 );
insert into tq84_tab values ( 2 , 'def' , 9.2 , 34.9 , 178.5 );
insert into tq84_tab values ( 3 , 'ghi' , 4.8 , 98.4 , 562.1 );
insert into tq84_tab values ( 4 , 'jkl' , 7.6 , 40.2 , 409.4 );

explain plan for
select
   *
from
  tq84_tab unpivot (
     val for txt in (
         val_foo as 'Foo',
         val_bar as 'Bar',
         val_baz as 'Baz'
     )
  )
;

select * from table(dbms_xplan.display(format=>'basic predicate'));
--
-- ----------------------------------------
-- | Id  | Operation           | Name     |
-- ----------------------------------------
-- |   0 | SELECT STATEMENT    |          |
-- |*  1 |  VIEW               |          |
-- |   2 |   UNPIVOT           |          |
-- |   3 |    TABLE ACCESS FULL| TQ84_TAB |
-- ----------------------------------------
--  
-- Predicate Information (identified by operation id):
-- ---------------------------------------------------
--  
--    1 - filter("unpivot_view_005"."VAL" IS NOT NULL)

drop table tq84_tab;