执行 explain 的时候没有做判空处理

Describe the bug 执行 explain 的时候没有做判空处理

To Reproduce Steps to reproduce the behavior: soar = new Soar(config); $sql = "select * from user_notifications; soar->explain(sql, 'md');

Expected behavior PHP Notice: Undefined index: partitions in ./vendor/guanguans/soar-php/src/PDO.php on line 71 PHP Notice: Undefined index: filtered in ./vendor/guanguans/soar-php/src/PDO.php on line 78