Re-organize table not working

[Wane cooper]

hi,

I would like to reorganize this table.....partition p4 needs to be split to 50000. Since my tables have sub-partitions i cant get the syntax right...I tired to search..but failed

alter table salaries1 reorganize partition p4 into (partition p4a values less than (50000)),subpartition sub1,subpartition sub2);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'subpartition sub1,subpartition sub2)' at line 1



CREATE TABLE salaries1 (
emp_no int(11) NOT NULL,
salary int(11) NOT NULL,
from_date date NOT NULL,
to_date date NOT NULL,
PRIMARY KEY ( emp_no ,salary, from_date )
) ENGINE=InnoDB
partition by range(emp_no)
subpartition by key (salary)
(
partition p0 values less than (10000) (
subpartition b1,
subpartition b2,
subpartition b3
),
partition p1 values less than (20000) (
subpartition b4,
subpartition b5,
subpartition b6
),
partition p2 values less than (30000) (
subpartition b7,
subpartition b8,
subpartition b9
),
partition p3 values less than (40000) (
subpartition b10,
subpartition b11,
subpartition b12
),
partition p4 values less than (80000) (
subpartition b13,
subpartition b14,
subpartition b15
),
partition p5 values less than (160000) (
subpartition b16,
subpartition b17,
subpartition b18
),
partition p6 values less than (3200000) (
subpartition b19,
subpartition b20,
subpartition b21
),
partition p7 values less than (6400000) (
subpartition b22,
subpartition b23,
subpartition b24
),
partition p8 values less than maxvalue (
subpartition b25,
subpartition b26,
subpartition b27
)
);