Table creation with auto_increment and default expressions behaves differently from MySQL

[zimulala]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

drop table t0;
create table t0 (c int(10), c1 int auto_increment default (rand(1)));

2. What did you expect to see? (Required)

ERROR 1067 (42000): Invalid default value for 'c1'

3. What did you see instead (Required)

Query OK, 0 rows affected (0.02 sec)

4. What is your TiDB version? (Required)

master