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mysql> drop table if exists test.t
mysql> create table test.t(a int primary key, b varchar(20))
mysql> alter table test.t set tiflash replica 1

mysql> insert into test.t values(0, 'hello')
mysql> insert into test.t values(1, 'world')

func> wait_table test t

mysql> alter table test.t add column c decimal(5,2)

mysql> alter table test.t add column d int default 2

mysql> alter table test.t add column e varchar(100)

mysql> update test.t set c = 0

mysql> set session tidb_isolation_read_engines='tiflash'; select * from test.t
+---+-------+------+------+------+
| a | b     | c    | d    | e    |
+---+-------+------+------+------+
| 0 | hello | 0.00 |    2 | NULL |
| 1 | world | 0.00 |    2 | NULL |
+---+-------+------+------+------+