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mysql> drop table if exists test.a1
mysql> create table test.a1(id int(11) NOT NULL AUTO_INCREMENT, name enum('A','B','C') DEFAULT NULL, PRIMARY KEY (id));
mysql> insert into test.a1 values (1,'A'),(2,'B'),(3,'C');
mysql> alter table test.a1 set tiflash replica 1;

func> wait_table test a1

mysql> set session tidb_isolation_read_engines='tiflash'; select * from test.a1 order by id;
+----+------+
| id | name |
+----+------+
|  1 | A    |
|  2 | B    |
|  3 | C    |
+----+------+

mysql> alter table test.a1 change name name enum('A','B','C', 'D');
mysql> insert into test.a1 values (4,'D');

mysql> set session tidb_isolation_read_engines='tiflash'; select * from test.a1 order by id;
+----+------+
| id | name |
+----+------+
|  1 | A    |
|  2 | B    |
|  3 | C    |
|  4 | D    |
+----+------+

mysql> SET SESSION SQL_MODE = ''; insert into test.a1 values (5,'');

mysql> set session tidb_isolation_read_engines='tiflash'; select * from test.a1 order by id;
+----+------+
| id | name |
+----+------+
|  1 | A    |
|  2 | B    |
|  3 | C    |
|  4 | D    |
|  5 |      |
+----+------+

mysql> set session tidb_isolation_read_engines='tiflash'; select name+0 from test.a1 order by id;
+--------+
| name+0 |
+--------+
|      1 |
|      2 |
|      3 |
|      4 |
|      0 |
+--------+

mysql> drop table if exists test.a1