Select from a collection of collections SELECT - CAST - MULTISET - TABLE

Question

Does someone have a suggestion for the SELECT statement which is performing a CAST?
I am on Oracle 10.2.0.1.0. The goal is to take a collection of a nested table and order it by color, then descr, then grown_by, saving it into an ordered collection (v_List2). Am getting error with ORA-22907 Invalid cast to a type that is not a nested table.
CREATE OR REPLACE TYPE     ot_fruit
AS OBJECT
    descr            VARCHAR2(100)
   ,color          VARCHAR2(50)
   ,grown_by          VARCHAR2(50) 
CREATE OR REPLACE TYPE tab_fruitList AS TABLE OF ot_fruit;
CREATE OR REPLACE TYPE     ot_tab_fruit
AS OBJECT
    fruit            tab_fruitList
DECLARE
   v_List  ot_tab_fruit := ot_tab_fruit(tab_fruitList(ot_fruit('apple','red','tree'),
                                                      ot_fruit('blueberry','blue','bush')
   v_List2 ot_tab_fruit := ot_tab_fruit(tab_fruitList());
BEGIN
  SELECT CAST ( MULTISET ( SELECT * FROM TABLE(v_List)
                           ORDER BY 2, 3, 1
                           <b> -- This compiles with ORA-22907 error
                              AS  ot_tab_fruit</b>
              ) INTO v_List2
  FROM DUAL;
  FOR i IN v_List2.FIRST..v_List2.LAST
  LOOP  
     DBMS_OUTPUT.PUT_LINE('i='||i||' descr='||v_List2(i).fruit.descr ||' color='||
           v_List2(i).fruit.color||' grown_by='||v_List2(i).fruit.grown_by);
  END LOOP;
END;Thanks, Kate
Message was edited by:
johnsok

Answer 1

This solution, which works perfectly by the way, came from Avi Abrami. I've highlighted the necessary changes to make the SELECT of a collection of objects work properly.
create or replace type OT_FRUIT as object (
  DESCR     varchar2(100)
,COLOR     varchar2(50)
,GROWN_BY  varchar2(50)
create or replace type TAB_FRUITLIST as table of OT_FRUIT;
create or replace type OT_TAB_FRUIT as object (
  FRUIT  TAB_FRUITLIST
DECLARE
   v_List  ot_tab_fruit := ot_tab_fruit(tab_fruitList(ot_fruit('apple','red','tree'),
                                                      ot_fruit('blueberry','blue','bush')
   v_List2 ot_tab_fruit := ot_tab_fruit(tab_fruitList());
BEGIN
  SELECT CAST ( MULTISET ( SELECT * FROM TABLE(v_List.fruit)
                           ORDER BY 2, 3, 1
                              AS tab_fruitlist
              ) INTO v_List2.fruit
  FROM DUAL;
  FOR i IN v_List2.fruit.FIRST..v_List2.fruit.LAST
  LOOP
     DBMS_OUTPUT.PUT_LINE('i='||i||' descr='||v_List2.fruit(i).descr ||' color='||
           v_List2.fruit(i).color||' grown_by='||v_List2.fruit(i).grown_by);
  END LOOP;
END;
/