public function updateMap($key, UpdateMap $builder)
    {
        $this->update($key, Riak\DataType\Map::TYPE, $builder);

        return $this;
    }
public function updateMap($key, UpdateMap $builder)
    {
        $this->update($key, Riak\DataType\Map::TYPE, $builder);

        return $this;
    }
@param $key
@param UpdateMap $builder

@return $this