INT representation translating TIMESTAMP to INT is inconsistent with MDB's

MariaDB [test]> create table cs2(i timestamp)engine=columnstore;

Query OK, 0 rows affected (0.353 sec)

MariaDB [test]> insert into cs2 values ('2022-05-21 00:00:00');

Query OK, 1 row affected (0.144 sec)

MariaDB [test]> select * from cs2;

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

| i                   |

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

| 2022-05-21 00:00:00 |

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

1 row in set (0.043 sec)

MariaDB [test]> select i + 1  from cs2;

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

| i + 1            |

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

| 1733391758131201 |

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

MariaDB [test]> create table t1(i timestamp);

Query OK, 0 rows affected (0.011 sec)

MariaDB [test]> insert into t1  values ('2022-05-21 00:00:00');

Query OK, 1 row affected (0.002 sec)

MariaDB [test]> select * from t1;

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

| i                   |

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

| 2022-05-21 00:00:00 |

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

1 row in set (0.000 sec)

MariaDB [test]> select i+1 from t1;

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

| i+1            |

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

| 20220521000001 |

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

1 row in set (0.000 sec)

MariaDB [test]>