src/Riak/Command/Builder/MapReduce/FetchObjects.php
public function buildLinkPhase($bucket = '', $tag = '', $keep = false)
    {
        $this->setPhase('link', $this->assemblePhaseData($bucket, '', '', '', $tag), $keep);

        return $this;
    }
public function buildLinkPhase($bucket = '', $tag = '', $keep = false)
    {
        $this->setPhase('link', $this->assemblePhaseData($bucket, '', '', '', $tag), $keep);

        return $this;
    }
buildReducePhase

Allows you to define the Reduce Query Phase by using parameters

@param string $bucket
@param string $tag
@param bool $keep

@internal param string $key
@internal param string $source
@internal param string $language
@return $this