mysql> create function create_stmt(tbl varchar(255), partition int unsigned)
    -> returns varchar(500)
    -> comment 'Generate a CREATE TABLE statement for the given table
    '> and partition number.'
    -> return concat(
    ->   'create table if not exists ', tbl, partition, ' like ', tbl);
ERROR 1607 (HY000): Cannot create stored routine `create_stmt`. Check warnings
mysql> show warnings;
+---------+------+------------------------------------------------------------+
| Level   | Code | Message                                                    |
+---------+------+------------------------------------------------------------+
| Warning | 1265 | Data truncated for column 'comment' at row 1               |
| Error   | 1607 | Cannot create stored routine `create_stmt`. Check warnings |
+---------+------+------------------------------------------------------------+
2 rows in set (0.00 sec)

mysql>