yittg commented on PR #4529:
URL: https://github.com/apache/iceberg/pull/4529#issuecomment-1094501133

   thanks @stevenzwu for providing this change.
   Personally, i'm not quite sure should we use a such big change to achieve 
this target.
   I wonder whether it is a better option to use a special invalid snapshot id 
value to do the same thing, such as `-1`. Checking this special value can be 
equivalent with null checking.
   
   Or please correct me if it has other effects. Also looking forward others' 
opinions.
   


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