実行計画順序の表示

/*
 。
 ：1. select 。2。 。
 ， ， 
*/
WITH t AS
 (SELECT LEVEL AS lv,
         connect_by_isleaf AS isleaf,
         connect_by_root(id) AS root_id,
         sys_connect_by_path(id, ',') AS id_path,
         id,
         operation,
         object_name,
         parent_id
    FROM (SELECT id, operation, object_name, parent_id
            FROM v$sql_plan
           WHERE sql_id = '&sqlid'
             AND child_number = &child_number)
   START WITH parent_id IS NULL
  CONNECT BY PRIOR id = parent_id),
l AS
 (SELECT id2,
         MAX(CASE
               WHEN id >= id0 AND id2 > 0 THEN
                id
               ELSE
                id + 999999
             END) AS lv2
    FROM (SELECT id,
                 MAX(to_number(regexp_substr(id_path, '[^,]+', 1, 2))) over() AS id0,
                 to_number(regexp_substr(id_path, '[^,]+', 1, LEVEL)) AS id2
            FROM t
           WHERE isleaf = 1
          CONNECT BY LEVEL <= lv
                 AND PRIOR id = id
                 AND PRIOR dbms_random.value() IS NOT NULL)
   GROUP BY id2)
SELECT row_number() over(ORDER BY l.lv2, t.lv DESC) AS sn,
       t.id,
       t.root_id,
       lpad('*', lv, '*') || operation AS operation,
       t.object_name,
       t.parent_id,
       t.isleaf,
       t.id_path
  FROM t
 INNER JOIN l
    ON l.id2 = t.id
 ORDER BY 2