[Bug] 2.0.5版本当数据删除之后再使用last_by函数查询会有数据返回，且这条数据为null

[meng-easonZhou]

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• I searched in the issues and found nothing similar.

Version

2.0.5 window版本

Describe the bug and provide the minimal reproduce step

表中对应的标签没有数据的情况下last_by查询是没有数据

给这个对应的标签添加一条数据

问题出现：删除这条数据之后，使用last_by 方法查询时会返回一条数据，这个数据全部返回的字段为空

What did you expect to see?

数据删除之后使用last_by查询应该不返回任何数据

What did you see instead?

数据删除之后使用last_by查询应该返回一条数据，而且这条数据全部字段都返回了null

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!

[github-actions]

Hi, this is your first issue in IoTDB project. Thanks for your report. Welcome to join the community!

[PDGGK]

I've submitted a fix for this issue in PR #17411. The root cause was that LastQueryAggTableScanOperator could still emit a result row when all LastByAccumulators had no initialized result after deletion. Two additional defensive fixes were included for aligned deletion paths in FileLoaderUtils and ModificationUtils.