EXPLAIN PARTITIONS INSERT doesn't show target partition

CREATE OR REPLACE TABLE t

(

	id INT UNSIGNED NOT NULL AUTO_INCREMENT,

	timestamp DATETIME NOT NULL,

	PRIMARY KEY (id, timestamp)

)

	ENGINE = InnoDB

PARTITION BY RANGE (YEAR(timestamp))

(

	PARTITION p0 VALUES LESS THAN (2010),

	PARTITION p1 VALUES LESS THAN (2015),

	PARTITION p2 VALUES LESS THAN (2020)

);

MariaDB [test]> EXPLAIN PARTITIONS INSERT INTO t (id, timestamp) VALUES (NULL, NOW());

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

| id   | select_type | table | partitions | type | possible_keys | key  | key_len | ref  | rows | Extra |

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

|    1 | INSERT      | t     | NULL       | ALL  | NULL          | NULL | NULL    | NULL | NULL | NULL  |

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

1 row in set (0.00 sec)