NilPortugues\Sql\QueryBuilder\Manipulation\Select::isJoinSelect PHP Метод

    public function isJoinSelect()
    {
        return $this->joinQuery->isJoin();
    }

 /**
  * @param Select $select
  *
  * @return string
  */
 public function write(Select $select)
 {
     if ($select->isJoinSelect()) {
         return $this->writer->writeJoin($select);
     }
     return $this->writeSelectQuery($select);
 }