create table t1 (a int not null primary key, b int, c varchar(80), e enum('a','b')) engine=aria;
insert into t1 (a) values (1),(2),(3);
alter online table t1 page_checksum=1;
alter online table t1 page_checksum=0;
alter online table t1 drop column b, add b int;
alter online table t1 modify b bigint;
alter online table t1 modify e enum('c','a','b');
alter online table t1 modify c varchar(50);
alter online table t1 modify c varchar(100);
alter online table t1 add f int;
alter online table t1 engine=memory;
alter online table t1 checksum=1;
alter online table t1 add constraint check (b > 0);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `c` varchar(100) DEFAULT NULL,
  `e` enum('c','a','b') DEFAULT NULL,
  `b` bigint(20) DEFAULT NULL,
  `f` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  CONSTRAINT `CONSTRAINT_1` CHECK (`b` > 0)
) ENGINE=MEMORY DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci CHECKSUM=1
drop table t1;