shanzhongkai commented on issue #13244:
URL: https://github.com/apache/hudi/issues/13244#issuecomment-2846301184

   > > does it mean that the primary key within the partition cannot be 
guaranteed to be unique
   > 
   > for single partition, the primary key is always unique.
   
   I have observed that if the index bootstrap is not enabled, no index 
information will be loaded into the state. This means that if I want to write 
some data to the **date=2020** partition, since the index information of the 
baseFile already exists in date=**2020** will not be loaded, the upsert data in 
**date=2020** will not be able to obtain duplicate information and cannot 
guarantee uniqueness. Is there any problem with my understanding?


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