code: protected function convertValueIds($valueResult, &$counter = null)
      {
          $result      = [];
          $aliases     = [];
          $idColumn    = $this->getIdColumn();
          $aliasColumn = $this->getAliasColumn();
          while ($row = $valueResult->fetch(\PDO::FETCH_OBJ)) {
              $valueId           = $row->$idColumn;
              $aliases[$valueId] = $row->$aliasColumn;
              $result[]          = $valueId;
          }
  
          if (($counter !== null) && !empty($result)) {
              $statement = $this->getConnection()->createQueryBuilder()
                  ->select('value_id', 'COUNT(value_id) as mm_count')
                  ->from('tl_metamodel_tag_relation')
                  ->where('att_id=:att')
                  ->andWhere('value_id IN (:values)')
                  ->groupBy('item_id')
                  ->setParameter('att', $this->get('id'))
                  ->setParameter('values', $result, Connection::PARAM_STR_ARRAY)
                  ->execute()
                  ->fetch(\PDO::FETCH_OBJ);
  
              $amount  = $statement->mm_count;
              $valueId = $statement->value_id;
              $alias   = $aliases[$valueId];
  
              $counter[$valueId] = $amount;
              $counter[$alias]   = $amount;
          }
  
          return $result;
      }
docs: Convert the value ids to a result array.
  
  @param Statement  $valueResult The database result.
  
  @param null|array $counter     The destination for the counter values.
  
  @return int[] The value ids that are represented by the passed database statement.