/*Query prototypeSELECT c.nameFROM products pLEFT JOIN companies c ON c.id = p.companyWHERE p.category = 2GROUP BY c.nameDQL:*/ $companies = Doctrine_Query::create() -> select("c.name") -> from("Product p") -> leftJoin("p.Company c") -> where("p.category = ?", $rd -> getParameter("id")) -> groupBy("c.name") -> execute();/*Catchable fatal error: Argument 1 passed to Doctrine_Hydrator_RecordDriver::getElement() must be an array, null given, called in C:\Server\www\tts\app\lib\model\doctrine\Doctrine\Hydrator.php on line 128 and defined in C:\Server\www\tts\app\lib\model\doctrine\Doctrine\Hydrator\RecordDriver.php on line 106*/