product_quantity needs to be float in filter

	function onProcessProductMassFilterproductColumn(&$elements,&$query,$filter,$num){
		if(empty($filter['type']) || $filter['type']=='all') return;
		if(!isset($this->massaction))$this->massaction = hikashop_get('class.massaction');
		if(count($elements)){
			foreach($elements as $k => $element){
				if(isset($element->$filter['type'])){
					$in = $this->massaction->checkInElement($element, $filter);
					if(!$in) unset($elements[$k]);
				}
			}
		}else{
			$db = JFactory::getDBO();
			if($filter['value'] == 0 || !empty($filter['value']) || (empty($filter['value']) && in_array($filter['operator'],array('IS NULL','IS NOT NULL')))){
				$query->where[] = $this->massaction->getRequest($filter,'hk_product');
			}
		}
	}