private function getLimitationData(OptimizerInterface $optimizer, $column)
    {
        $select = $this->getConnection()
            ->select()
            ->from($this->getMainTable(), $column)
            ->where($this->getConnection()->quoteInto(OptimizerInterface::OPTIMIZER_ID . " = ?", (int) $optimizer->getId()));

        return $this->getConnection()->fetchCol($select);
    }