public function fetchEntityGroup(Entity $obj_entity)
    {
        $arr_results = $this->obj_gateway
            ->withSchema($this->obj_schema)
            ->withTransaction($this->str_transaction_id)
            ->gql("SELECT * FROM `" . $this->obj_schema->getKind() . "` WHERE __key__ HAS ANCESTOR @ancestorKey", [
                'ancestorKey' => $obj_entity
            ]);
        $this->str_last_cursor = $this->obj_gateway->getEndCursor();
        return $arr_results;
    }