phprs\ezsql\Rows::leftJoin PHP 메소드

    public static function leftJoin(&$lh, $rh, $lKey, $rkey, $destKey)
    {
        $map = array_combine(self::column($rh, $rkey), $rh);
        foreach ($lh as &$v) {
            $v[$destKey] = $map[$v[$lKey]];
        }
    }