假如MySQL改了字段，触发器能把修改的字段改成原字段吗？

例如：
show create table t\G
1. row **

   Table: t

Create Table: CREATE TABLE t (
id int(11) DEFAULT NULL,
name varchar(20) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4

MariaDB [test]> alter table t change id id int(20);
Query OK, 0 rows affected (0.29 sec)
Records: 0 Duplicates: 0 Warnings: 0

MariaDB [test]> show create table t\G
1. row **

   Table: t

Create Table: CREATE TABLE t (
id int(20) DEFAULT NULL,
name varchar(20) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)
怎么把int(20)自动改回来的int(11)？