Pinq\Queries\Common\Join\Options::isGroupJoin PHP Method

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

 public function updateJoinOptions(Queries\Common\Join\Options $options)
 {
     $filter = $options->getFilter();
     if ($filter instanceof Queries\Common\Join\Filter\Custom) {
         $filter = $filter->update($this->expressionProcessor->processFunction($filter->getOnFunction()));
     } elseif ($filter instanceof Queries\Common\Join\Filter\Equality) {
         $filter = $filter->update($this->expressionProcessor->processFunction($filter->getOuterKeyFunction()), $this->expressionProcessor->processFunction($filter->getInnerKeyFunction()));
     }
     return $options->update($options->getSource(), $options->isGroupJoin(), $filter, $options->hasDefault());
 }