mapReduce issue

gistfile1.txt

	/**
	 * @param Event $event
	 * @param Query $query
	 * @return void
	 */
	public function beforeFind(Event $event, Query $query) {
		$this->encodeBitmaskConditions($query);

		$field = $this->_config['field'];
		if (!($mappedField = $this->_config['mappedField'])) {
			$mappedField = $field;
		}

		$mapper = function ($row, $key, $mr) use ($field, $mappedField) {
			$row->set($mappedField, $this->decodeBitmask($row->get($field)));
    };
    // once this is added, the 7 results are suddently gone (empty array then)
    //$query->mapReduce($mapper);
	}