def _db_type_for_alter_column(self, field):
        """
        Returns a field's type suitable for ALTER COLUMN.
        By default it just returns field.db_type().
        To be overriden by backend specific subclasses
        @param field: The field to generate type for
        """
        try:
            return field.db_type(connection=self._get_connection())
        except __HOLE__:
            return field.db_type()
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/South-1.0.2/south/db/generic.py/DatabaseOperations._db_type_for_alter_column