/**
* Add a reduce phase to the map/reduce operation
*
* @param mixed $function - Either a named Javascript function (ie:
* "Riak.mapValues"), or an anonymous javascript function (ie:
* "function(...) { ... }" or an array ["erlang_module",
* "function"].
* @param array() $options - An optional associative array
* containing "language", "keep" flag, and/or "arg".
* @return $this
*/
public function reduce($function, $options = array())
{
$language = is_array($function) ? "erlang" : "javascript";
$this->phases[] = new MapReducePhase("reduce", $function, Utils::get_value("language", $options, $language), Utils::get_value("keep", $options, false), Utils::get_value("arg", $options, null));
return $this;
}
