Magento collection iterator - cannot get additional attribute

I can't get additional attribute 'name' from product collection when I'm using resource iterator. My product collection: ``` $productCollection = Mage::getModel('catalog/product')->getCollection(); $productCollection->addAttributeToSelect('name') ->joinField('category_id', 'catalog/category_product', 'category_id', 'product_id=entity_id', null, 'left') ->addAttributeToFilter('category_id', array('in' => $subCategories))->addAttributeToFilter('visibility', '4') ->getSelect()->group('e.entity_id'); ``` Iterator: ``` Mage::getSingleton('core/resource_iterator')->walk($productCollection->getSelect(), array(array($this, 'generateXml'))); ``` generateXml function: ``` public function generateXml($args){ var_dump($args['row']); ... array(11) { ["entity_id"]=> string(5) "49335" ["entity_type_id"]=> string(1) "4" ["attribute_set_id"]=> string(2) "18" ["type_id"]=> string(6) "simple" ["sku"]=> NULL ["has_options"]=> string(1) "0" ["required_options"]=> string(1) "0" ["created_at"]=> string(19) "2014-05-28 19:18:49" ["updated_at"]=> string(19) "2014-05-28 19:20:21" ["category_id"]=> string(3) "236" ["visibility"]=> string(1) "4" } ``` Thanks in advance.