hash join 驱动表和被驱动表不一定是全表扫描

explain plan for SELECT A.*
  FROM (SELECT /*+ use_hash(cd cv)*/  CD.*,
               nvl(CV.SUM_CI_BALANCE, 0) as SUM_CI_BALANCE,
               nvl(CV.SUM_LN_BALANCE, 0) as SUM_LN_BALANCE
          FROM OCRM_F_CI_CUST_DESC CD
          left join (
                   select cust_id,
                           FR_ID,
                           sum(CI_BALANCE) as sum_CI_BALANCE,
                           sum(LN_BALANCE) as sum_LN_BALANCE
                      from OCRM_F_CI_CUST_VIEW
                     where 1 = 1
                       and FR_ID = '15601'
                       and MGR_ID = '00001'
                            group by cust_id, FR_ID
                       union
                       select cust_id,
                           FR_ID,
                           sum(CI_BALANCE) as sum_CI_BALANCE,
                           sum(LN_BALANCE) as sum_LN_BALANCE
                      from OCRM_F_CI_CUST_VIEW
                     where 1 = 1
                       and FR_ID = '15601'
                       and MGR_ID IN
                           (SELECT USER_ID
                               FROM ADMIN_AUTH_MANAGE_ACCOUNT
                              WHERE MANAGE_ID = '00001')
                               group by cust_id, FR_ID) CV
            on CD.Cust_Id = CV.cust_id
           and CD.Fr_Id = CV.fr_id
         WHERE 1 = 1
           and CD.FR_ID = '15601') A
 where 1 = 1
   AND ((EXISTS
      (SELECT 1
            FROM OCRM_F_CI_BELONG_CUSTMGR MGR
           WHERE MGR.CUST_ID = A.CUST_ID
             AND MGR.MGR_ID = '00001'
             union
             (SELECT 1
            FROM OCRM_F_CI_BELONG_CUSTMGR MGR
           WHERE MGR.CUST_ID = A.CUST_ID
             and MGR.MGR_ID IN (SELECT USER_ID
                                   FROM ADMIN_AUTH_MANAGE_ACCOUNT
                                  WHERE MANAGE_ID = '00001')))
                                  ))
 ORDER BY to_number(SUM_CI_BALANCE) DESC, to_number(SUM_LN_BALANCE) DESC;


select * from table(dbms_xplan.display());
Plan hash value: 4170314995
 
---------------------------------------------------------------------------------------------------------------------
| Id  | Operation                         | Name                    | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
---------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                  |                         |     1 |   256 |       | 38928   (1)| 00:07:48 |
|   1 |  SORT ORDER BY                    |                         |     1 |   256 |       | 38928   (1)| 00:07:48 |
|*  2 |   HASH JOIN OUTER                 |                         |     1 |   256 |       | 38927   (1)| 00:07:48 |
|*  3 |    HASH JOIN                      |                         |     1 |   201 |       | 24033   (1)| 00:04:49 |
|   4 |     VIEW                          | VW_SQ_1                 |  1086K|    12M|       | 14082   (1)| 00:02:49 |
|   5 |      SORT UNIQUE                  |                         |     1 |    41M|    49M| 14082   (1)| 00:02:49 |
|   6 |       UNION-ALL                   |                         |       |       |       |            |          |
|*  7 |        INDEX FAST FULL SCAN       | IDX_CI_BELONG_CUSTMGR   |   162 |  4374 |       |  1473   (1)| 00:00:18 |
|*  8 |        HASH JOIN                  |                         |  1086K|    41M|       |  1496   (1)| 00:00:18 |
|*  9 |         INDEX RANGE SCAN          | IDX_AUTH_MANAGE_ACCOUNT |  6135 | 79755 |       |    21   (0)| 00:00:01 |
|  10 |         INDEX FAST FULL SCAN      | IDX_CI_BELONG_CUSTMGR   |  1043K|    26M|       |  1472   (1)| 00:00:18 |
|* 11 |     TABLE ACCESS FULL             | OCRM_F_CI_CUST_DESC     |   541K|    97M|       |  4994   (1)| 00:01:00 |
|  12 |    VIEW                           |                         |   414K|    21M|       | 14892   (1)| 00:02:59 |
|  13 |     SORT UNIQUE                   |                         |   414K|    20M|    31M| 14892   (1)| 00:02:59 |
|  14 |      UNION-ALL                    |                         |       |       |       |            |          |
|  15 |       HASH GROUP BY               |                         |    90 |  3510 |       |   113   (1)| 00:00:02 |
|* 16 |        TABLE ACCESS BY INDEX ROWID| OCRM_F_CI_CUST_VIEW     |   126 |  4914 |       |   112   (0)| 00:00:02 |
|* 17 |         INDEX RANGE SCAN          | IDX_OCRM_F_CI_CUST_VIEW |   146 |       |       |     3   (0)| 00:00:01 |
|  18 |       HASH GROUP BY               |                         |   414K|    20M|    31M| 14779   (1)| 00:02:58 |
|* 19 |        HASH JOIN RIGHT SEMI       |                         |   550K|    27M|       |  2874   (1)| 00:00:35 |
|* 20 |         INDEX RANGE SCAN          | IDX_AUTH_MANAGE_ACCOUNT |  6135 | 79755 |       |    21   (0)| 00:00:01 |
|* 21 |         TABLE ACCESS FULL         | OCRM_F_CI_CUST_VIEW     |   804K|    29M|       |  2851   (1)| 00:00:35 |
---------------------------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("CD"."FR_ID"="CV"."FR_ID"(+) AND "CD"."CUST_ID"="CV"."CUST_ID"(+))
   3 - access("VW_COL_1"="CD"."CUST_ID")
   7 - filter("MGR"."MGR_ID"='00001')
   8 - access("MGR"."MGR_ID"="USER_ID")
   9 - access("MANAGE_ID"='00001')
  11 - filter("CD"."FR_ID"='15601')
  16 - filter("FR_ID"='15601')
  17 - access("MGR_ID"='00001')
  19 - access("MGR_ID"="USER_ID")
  20 - access("MANAGE_ID"='00001')
  21 - filter("FR_ID"='15601')