If you need show $query in Yii 2 like one line SQL string for debug then you can write this:
var_dump($query->prepare(Yii::$app->db->queryBuilder)->createCommand()->rawSql);
If you need show $query in Yii 2 like one line SQL string for debug then you can write this:
var_dump($query->prepare(Yii::$app->db->queryBuilder)->createCommand()->rawSql);