code: public function getMatchingIds()
      {
          $matches = $this->connection->executeQuery($this->queryString, $this->params, $this->types);
          $ids     = [];
          foreach ($matches->fetchAll(\PDO::FETCH_ASSOC) as $value) {
              $ids[] = $value[$this->idColumn];
          }
  
          return $ids;
      }
docs: {@inheritdoc}