Anykin

$aggregatehydrator = new AggregateHydrator();
$aggregatehydrator->setEventManager($container->get('EventManager'));

SELECT `articles`.`id` AS `id`, `articles`.`title` AS `title`, 
GROUP_CONCAT(tags.title) AS `tagsDb`, GROUP_CONCAT(tag_weights.tag_weight) AS `tagsWeight` 
FROM `articles` LEFT JOIN `articles_tags` ON `articles`.`id` = `articles_tags`.`article_id` 
LEFT JOIN `tags` ON `articles_tags`.`tag_id` = `tags`.`id` 
LEFT JOIN (SELECT `articles_tags`.`tag_id` AS `tag_id`, 
COUNT(`article_id`) AS `tag_weight` FROM `articles_tags` GROUP BY `tag_id`) 
AS `tag_weights` ON `articles_tags`.`tag_id` = `tag_weights`.`tag_id` WHERE `articles`.`id` = 336

$select = $sql->select('articles'); 	
        $select->where(array('articles.id = ?' => $id));
        
        $select->join(
            'articles_tags', 'articles.id = articles_tags.article_id',
            array(), 
            $select::JOIN_LEFT
        );
        
        $select->join(
            'tags', 'articles_tags.tag_id = tags.id',
            array(), 
            $select::JOIN_LEFT
        );
        
        $subSelect = $sql->select('articles_tags');
        $subSelect->columns(array(
            'tag_id',
            'tag_weight' => new Expression('COUNT(`article_id`)')
        ));
        
        $subSelect->group('tag_id');
        
        $select->join(
            array('tag_weights' => $subSelect), 
            'articles_tags.tag_id = tag_weights.tag_id',
            array(), 
            $select::JOIN_LEFT
        );
        
        $select->columns(array(
            'id' => 'id',
            'title' => 'title',
            'text' => 'text',
            'summary' => 'summary',
            'categoryId' => 'categoryId',
            'author' => 'author',
            'created' => 'created',
            'updated' => 'updated',
            'published' => 'published',
            'isPublished' => 'isPublished',
            'version' => 'version',
            'tagsDb' => new Expression('GROUP_CONCAT(tags.title)'),
            'tagsWeight' => new Expression('GROUP_CONCAT(tag_weights.tag_weight)')
        ));

id 	title 	tagsDb 	                 tagsWeight
	336 	sdaf 	tag1,tag2,tag3,qw 	3,3,3,6