public function hasColumn($name, $type = null, $length = null, $options = array())
 {
     // Temporary coping with the problem reported in http://trac.symfony-project.org/ticket/6873
     if ('string' === $type && is_null($length)) {
         $length = 2147483647;
     }
     return parent::hasColumn($name, $type, $length, $options);
 }