private function _checkUnsupportedFeatures()
    {
        $addCons = $this->_sql->getConstraints();
        $droppedCons = $this->_sql->getDroppedConstraints();
        $droppedColumns = $this->_sql->getDroppedColumns();
        $changedColumns = $this->_sql->getChangedColumns();

        return empty($addCons) && empty($changedColumns)
            && empty($droppedColumns) && empty($droppedCons);
    }