CBO bug or not, or else develop do not consider the function index

SQL> create table test_fun_or as select object_id+sysdate id,object_name from        

  2  dba_objects;

Table created.

SQL> create index i_test_fun_or on test_fun_or(id,'a') nologging;   

//I don't know why oracle consider it as function index

Index created.

SQL> create index i_test_fun_or_1 on test_fun_or(object_name) nologging;

Index created.

SQL> set autot trace exp

SQL> exec dbms_stats.gather_table_stats(user,'TEST_FUN_OR',estimate_percent=>null,method_opt=>'for all columns size 1');

 

PL/SQL procedure successfully completed.

 

SQL> select * from test_fun_or where id=sysdate or object_name='aa';

 

Execution Plan

----------------------------------------------------------

Plan hash value: 3247456674

 

---------------------------------------------------------------------------------

| Id  | Operation         | Name        | Rows  | Bytes | Cost (%CPU)| Time     |

---------------------------------------------------------------------------------

|   0 | SELECT STATEMENT  |             |     3 |    87 |   219   (3)| 00:00:03 |

|*  1 |  TABLE ACCESS FULL| TEST_FUN_OR |     3 |    87 |   219   (3)| 00:00:03 |

---------------------------------------------------------------------------------

 

Predicate Information (identified by operation id):

---------------------------------------------------

 

   1 - filter("OBJECT_NAME"='aa' OR "ID"=SYSDATE@!)

 

SQL> select /*+ use_concat */ * from test_fun_or where id=sysdate or object_name='aa'; 

//or expand don't use index i_test_fun_or

 

Execution Plan

----------------------------------------------------------

Plan hash value: 3161566054

 

------------------------------------------------------------------------------------------------

| Id  | Operation                    | Name            | Rows  | Bytes | Cost (%CPU)| Time     |

------------------------------------------------------------------------------------------------

|   0 | SELECT STATEMENT             |                 |     3 |    87 |   224   (3)| 00:00:03 |

|   1 |  CONCATENATION               |                 |       |       |            |          |

|*  2 |   TABLE ACCESS FULL          | TEST_FUN_OR     |     1 |    29 |   219   (3)| 00:00:03 |

|*  3 |   TABLE ACCESS BY INDEX ROWID| TEST_FUN_OR     |     2 |    58 |     5   (0)| 00:00:01 |

|*  4 |    INDEX RANGE SCAN          | I_TEST_FUN_OR_1 |     2 |       |     3   (0)| 00:00:01 |

------------------------------------------------------------------------------------------------

 

Predicate Information (identified by operation id):

---------------------------------------------------

 

   2 - filter("ID"=SYSDATE@!)

   3 - filter(LNNVL("ID"=SYSDATE@!))

   4 - access("OBJECT_NAME"='aa')

 

SQL> drop index i_test_fun_or;

 

Index dropped.

 

SQL> create index i_test_fun_or on test_fun_or(id,object_name) nologging;

 

Index created.

 

SQL> alter table test_fun_or modify object_name not null;

 

Table altered.

 

SQL> select /*+ use_concat */ * from test_fun_or where id=sysdate or object_name='aa';

 

Execution Plan

----------------------------------------------------------

Plan hash value: 1705821130

 

------------------------------------------------------------------------------------------------

| Id  | Operation                    | Name            | Rows  | Bytes | Cost (%CPU)| Time     |

------------------------------------------------------------------------------------------------

|   0 | SELECT STATEMENT             |                 |     3 |    87 |     8   (0)| 00:00:01 |

|   1 |  CONCATENATION               |                 |       |       |            |          |

|*  2 |   INDEX RANGE SCAN           | I_TEST_FUN_OR   |     1 |    29 |     3   (0)| 00:00:01 |

|*  3 |   TABLE ACCESS BY INDEX ROWID| TEST_FUN_OR     |     2 |    58 |     5   (0)| 00:00:01 |

|*  4 |    INDEX RANGE SCAN          | I_TEST_FUN_OR_1 |     2 |       |     3   (0)| 00:00:01 |

------------------------------------------------------------------------------------------------

 

Predicate Information (identified by operation id):

---------------------------------------------------

    2 - access("ID"=SYSDATE@!)

   3 - filter(LNNVL("ID"=SYSDATE@!))

   4 - access("OBJECT_NAME"='aa')

Jinyu wrote:
Thanks Jonathan, I don't have 11.2.0.2 on-site, I'll test it later, I just test it on 11.2.0.1

If you see the notes of fixed a bug fixes for 11.2.0.2 Group (Doc ID:1179583.1) it's bug 8352378 "allow index GOLD-Expansion functions.

Concerning
Jonathan Lewis

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