Different handling of out-of-range values for virtual columns with and without indexes

MariaDB [test]> CREATE TABLE t1 (i INT, vc TINYINT AS (i) VIRTUAL);

Query OK, 0 rows affected (0.54 sec)

MariaDB [test]> INSERT INTO t1 (i) VALUES (1000);

Query OK, 1 row affected (0.07 sec)

MariaDB [test]> CREATE TABLE t1 (i INT, vc TINYINT AS (i) VIRTUAL, INDEX(vc));

Query OK, 0 rows affected (0.63 sec)

MariaDB [test]> INSERT INTO t1 (i) VALUES (1000);

Query OK, 1 row affected, 1 warning (0.08 sec)

MariaDB [test]> SHOW WARNINGS;

+---------+------+---------------------------------------------+

| Level   | Code | Message                                     |

+---------+------+---------------------------------------------+

| Warning | 1264 | Out of range value for column 'vc' at row 1 |

+---------+------+---------------------------------------------+

1 row in set (0.00 sec)