Doctrine\MongoDB\Query\Builder::mapReduceOptions PHP Method

    public function mapReduceOptions(array $options)
    {
        if ($this->query['type'] !== Query::TYPE_MAP_REDUCE) {
            throw new BadMethodCallException('This method requires a mapReduce command (call map() or mapReduce() first)');
        }
        $this->query['mapReduce']['options'] = $options;
        return $this;
    }