QQueryBuilder::AddGroupByItem PHP Method

    public function AddGroupByItem($strItem)
    {
        array_push($this->strGroupByArray, $strItem);
    }

 public function UpdateQueryBuilder(QQueryBuilder $objBuilder)
 {
     $intLength = count($this->objNodeArray);
     for ($intIndex = 0; $intIndex < $intLength; $intIndex++) {
         $objBuilder->AddGroupByItem($this->objNodeArray[$intIndex]->GetColumnAlias($objBuilder));
     }
 }