MySQL does not support varchar fields with a length >=256. (varchar(256))

see http://dev.mysql.com/doc/refman/8.0/en/char.html

Up to varchar(255) everything is fine but then problems start. The hibernate SchemaExport silently ignores the problem if haltonerror=false. If haltonerror=true it fails long before the real problem comes up while droping missing constraints.
I am not sure if it is really fair to blame hibernate or the hibernate dialect for mysqls behavior. So classification as "bug" might be wrong..

Would it be possible to introduce a way to switch automatically to a different datatype like text for varchar 256 and greater in the schema generation? Or would it just be the best solution to switch to mysql type "text" in general instead of "varchar" in the dialect?

see http://dev.mysql.com/doc/refman/8.0/en/blob.html