我有两种类型的查询，按Kind和GQL
$query = $datastore->query()->kind('files')->filter('tags','=','texture')->filter('tags','=','newspaper')->start($pageCursor);
这提供了比bellow查询更多的结果：
$query = $datastore->gqlQuery("SELECT * FROM files where tags='texture' and tags='newspaper'",['allowLiterals' => true]);
为什么他们的结果不一样？