Pinq\Queries\Segments\Join::getJoiningFunction PHP Method

    public final function getJoiningFunction()
    {
        return $this->joiningFunction;
    }

 public function visitJoin(Segments\Join $query)
 {
     $this->traversable = self::evaluateJoinOptions($this->traversable, $query->getOptions(), $this->resolvedParameters)->to($this->resolvedParameters[$query->getJoiningFunction()->getCallableId()]);
 }