yii\mongodb\QueryBuilder::explain PHP Метод

    public function explain($collectionName, $query)
    {
        $query = array_merge(['find' => $collectionName], $query);
        if (isset($query['filter'])) {
            $query['filter'] = (object) $this->buildCondition($query['filter']);
        }
        if (isset($query['projection'])) {
            $query['projection'] = $this->buildSelectFields($query['projection']);
        }
        if (isset($query['sort'])) {
            $query['sort'] = $this->buildSortFields($query['sort']);
        }
        return ['explain' => $query];
    }