mysql> DROP TABLE IF EXISTS t1;
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE TABLE t1 (a VARCHAR(1)) CHARACTER SET latin2 COLLATE latin2_czech_cs;
Query OK, 0 rows affected (0.05 sec)

mysql> INSERT INTO t1 VALUES (0xF3),(0xD3);
Query OK, 2 rows affected (0.00 sec)
Records: 2  Duplicates: 0  Warnings: 0

mysql> DROP TABLE IF EXISTS t2;
Query OK, 0 rows affected (0.11 sec)

mysql> CREATE TABLE t2 AS SELECT weight_string(a) FROM t1;
Query OK, 2 rows affected, 2 warnings (0.36 sec)
Records: 2  Duplicates: 0  Warnings: 2

mysql> SHOW WARNINGS;
+---------+------+-------------------------------------------------------+
| Level   | Code | Message                                               |
+---------+------+-------------------------------------------------------+
| Warning | 1265 | Data truncated for column 'weight_string(a)' at row 1 |
| Warning | 1265 | Data truncated for column 'weight_string(a)' at row 2 |
+---------+------+-------------------------------------------------------+
2 rows in set (0.00 sec)

mysql> SHOW CREATE TABLE t2;
+-------+-----------------------------------------------------------------------------------------------------------+
| Table | Create Table                                                                                              |
+-------+-----------------------------------------------------------------------------------------------------------+
| t2    | CREATE TABLE `t2` (
  `weight_string(a)` varbinary(1) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+-----------------------------------------------------------------------------------------------------------+
1 row in set (0.16 sec)

mysql> SELECT LENGTH(weight_string(a)) FROM t1;
+--------------------------+
| LENGTH(weight_string(a)) |
+--------------------------+
|                        8 |
|                        8 |
+--------------------------+
2 rows in set (0.00 sec)