JackieTien97 opened a new pull request, #14458:
URL: https://github.com/apache/iotdb/pull/14458

   Assuming that we have the following file distribution, and all the files 
shown have been degraded to FileTimeIndex:
   
![image](https://github.com/user-attachments/assets/97485e4a-9d53-4c31-88cb-dd6b9a140a6d)
   
   While we do scanning, we will firstly unpack the frist seq file and the 
first and second unseq file, then while we merge on read, we will continue to 
get timestamp 4, then we using startTime of the second seq time which is 5 to 
judge whether it's overlapped with timestamp 4. 5 is larger than 4, so we think 
that the second seq tsfile isn't overlapped with timestamp 4, and as it's in 
seq space, so we mistakenly assumend that none of the subsequent files would 
overlap with timestamp 4.
   
   The above processing is correct while there doesn't exist degraded resource 
in seq space, however while exsiting degraded resource in seq space, if current 
seq tsfile's startTime is larger than the current timestamp, we cannot conclude 
that the startTime of subsequent seq tsfiles are all larger than current 
timestamp


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