MyRocks-Gap-Lock: range locking bounds are incorrect for multi-part keys

create table ten(a int);

insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t4 (

  kp1 int not null,

  kp2 int not null,

  a int,

  primary key(kp1, kp2)

) engine=rocksdb;

insert into t4 select 1,a, 1234 from ten;

insert into t4 values (2, 3, 1234);

insert into t4 values (2, 5, 1234);

insert into t4 values (2, 7, 1234);

insert into t4 select 3,a, 1234 from ten;

mysql> begin;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from t4 where kp1=2 and kp2 between 1 and 10 for update;

+-----+-----+------+

| kp1 | kp2 | a    |

+-----+-----+------+

|   2 |   3 | 1234 |

|   2 |   5 | 1234 |

|   2 |   7 | 1234 |

+-----+-----+------+

3 rows in set (0.01 sec)

mysql> select * from information_schema.rocksdb_locks;

+------------------+----------------+-----------------------------------------------------+------+

| COLUMN_FAMILY_ID | TRANSACTION_ID | KEY                                                 | MODE |

+------------------+----------------+-----------------------------------------------------+------+

|                0 |             26 | 000001068000000280000001 - 00000106800000028000000a | X    |

+------------------+----------------+-----------------------------------------------------+------+

1 row in set (0.00 sec)

mysql> insert into t4 values ( 2,9,9999);

ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction: Timeout on index: test.t4.PRIMARY

mysql> begin;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from t4 where kp1=2 for update;

+-----+-----+------+

| kp1 | kp2 | a    |

+-----+-----+------+

|   2 |   3 | 1234 |

|   2 |   5 | 1234 |

|   2 |   7 | 1234 |

+-----+-----+------+

3 rows in set (0.00 sec)

mysql> select * from information_schema.rocksdb_locks;

+------------------+----------------+--------------------------+------+

| COLUMN_FAMILY_ID | TRANSACTION_ID | KEY                      | MODE |

+------------------+----------------+--------------------------+------+

|                0 |             28 | 000001068000000280000007 | X    |

|                0 |             28 | 000001068000000280000005 | X    |

|                0 |             28 | 000001068000000280000003 | X    |

|                0 |             28 | 0000010680000002         | X    |

+------------------+----------------+--------------------------+------+

4 rows in set (0.00 sec)

mysql> insert into t4 values ( 2,9,9999);

Query OK, 1 row affected (0.01 sec)