Come spiegare i risultati di una query Oracle in base al valore di una colonna

SQL Fiddle

Impostazione dello schema Oracle 11g R2 :

CREATE TABLE test ( col1, col2 ) AS
          SELECT 'a', 2 FROM DUAL
UNION ALL SELECT 'b', 3 FROM DUAL
UNION ALL SELECT 'c', 1 FROM DUAL

Query 1 :

SELECT col1,
       col2
FROM   test t,
       TABLE(
         CAST( 
           MULTISET(
             SELECT LEVEL
             FROM   DUAL
             CONNECT BY LEVEL <= t.col2
           )
           AS SYS.ODCINUMBERLIST
         )
       )

Risultati :

| COL1 | COL2 |
|------|------|
|    a |    2 |
|    a |    2 |
|    b |    3 |
|    b |    3 |
|    b |    3 |
|    c |    1 |