codope commented on pull request #4749:
URL: https://github.com/apache/hudi/pull/4749#issuecomment-1031319868


   > sorry for the confused description. I edited again.
   
   Thanks for the clarification. 
   I still have this question. Suppose user did bulk insert in a table created 
with version 0.10.0 and now upgrades and runs another bulk insert with 0.11.0 
where default is now TIMESTAMP_MICROS. Is the type change from TIMESTAMP_MILLIS 
to TIMESTAMP_MICROS backward compatible? For your example, in the newer 
version, `1635234243` would be some date in the year 1970 while `1635234243000` 
would be much more recent. Wouldn't this affect the queries? 


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