private function appendGroupByList(\Aztech\Skwal\Visitor\Printer\Assembler\Select $assembler,\Aztech\Skwal\Query\Select $query)
    {
        $this->expressionVisitor->useAliases(false);
        
        $groupByList = array();
        
        foreach ($query->getGroupingColumns() as $groupingColumn) {
            $groupByList[] = $this->expressionVisitor->printExpression($groupingColumn);
        }
        
        $assembler->setGroupByList($groupByList);
    }