ms2 вывод уникальных тегов

tags.tpl

{set $parents = '!pdoResources' | snippet: [
    'returnIds' => 1,
    'parents' => 9,
    'depth'=> 15,
    'limit' => 0,
    'where' => [
        'class_key' => 'msCategory'
    ]

]}
{set $parentsArr = $parents | split}
{'!pdoResources' | snippet: [
   'class' => 'msProductOption',
   'limit' => 0,
   'sortby' => 'key',
   'leftJoin' => [
       'Resource' => [
           'class' => 'modResource',
           'on' => 'Resource.id = msProductOption.product_id'
       ],
   ],
   'select' => [
       'Resource' => 'parent',
       'msProductOption' => '*'
   ],
   'groupby' => 'msProductOption.value',
   'where' => [
       'key' => 'tags',
       'Resource.parent:IN' => $parentsArr,
   ]
   'tpl' => '',
]}