[Bug] last查询乱序

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

1.0.1

### Describe the bug and provide the minimal reproduce step

直接进行last查询。

### What did you expect to see?

希望last查询能按功能描述的一样正常运行

### What did you see instead?

last查询乱序，如果不使用last查询，而是select ...order by time desc 数据的时序又是正常的

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start by reproducing the last query on IoTDB 1.0.1 and compare its result order with SELECT ... ORDER BY time DESC. Trace the last-query execution path to determine where ordering diverges from the documented behavior. Done means last results are returned in the expected order and the regression is covered by a test.

Written by the indexing model from the issue text.