generated column is not compatible with mysql

[xiongjiwei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

mysql> CREATE TABLE table_name (
    ->     column1 INT,
    ->     column2 INT UNSIGNED GENERATED ALWAYS AS (column1 - 100)
    -> );
mysql> insert into table_name(column1) values (99);
ERROR 1690 (22003): constant -1 overflows int
mysql> set @@sql_mode='';
Query OK, 0 rows affected (0.00 sec)

mysql> insert into table_name(column1) values (99);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> select * from table_name;
+---------+------------+
| column1 | column2    |
+---------+------------+
|     101 |          1 |
|      99 | 4294967295 |
+---------+------------+
2 rows in set, 1 warning (0.00 sec)

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

mysql> CREATE TABLE table_name (
    ->     column1 INT,
    ->     column2 INT UNSIGNED GENERATED ALWAYS AS (column1 - 100)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql> insert into table_name(column1) values (101);
Query OK, 1 row affected (0.00 sec)

mysql> insert into table_name(column1) values (99);
ERROR 1264 (22003): Out of range value for column 'column2' at row 1
mysql> set @@sql_mode='';
Query OK, 0 rows affected (0.01 sec)

mysql> insert into table_name(column1) values (99);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> show warnings;
+---------+------+--------------------------------------------------+
| Level   | Code | Message                                          |
+---------+------+--------------------------------------------------+
| Warning | 1264 | Out of range value for column 'column2' at row 1 |
+---------+------+--------------------------------------------------+
1 row in set (0.00 sec)

mysql> select * from t;
Empty set (0.00 sec)

mysql> select * from table_name;
+---------+---------+
| column1 | column2 |
+---------+---------+
|     101 |       1 |
|      99 |       0 |
+---------+---------+
2 rows in set (0.00 sec)

as you can see there are 2 issues

1. error message is not the same
2. the query result is different

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

[jiyfhust]

/assign