dentiny opened a new pull request, #1276:
URL: https://github.com/apache/iceberg-rust/pull/1276

   ## Which issue does this PR close?
   
   This PR sync up with upstream iceberg spec on deletion vector related fields.
   Reference PR: https://github.com/apache/iceberg/pull/11240
   Reference file: 
https://github.com/apache/iceberg/blob/main/format/spec.md#manifests
   
   Context:
   I'm working on iceberg related projects in my company, one of the features 
I'm working on is deletion vector.
   Because there's no existing rust support for it, I need to do some of the 
work my own (i.e. deletion vector read and write).
   
   My philosophy is to reduce discrepancy with upstream is:
   - Avoid touching existing code unless unavoidable, and collaborate with open 
community if possible;
   - For deletion vector issue, I could make no other changes and keep puffin 
write/read completely change on my end;
   - The schema change in this PR is something hard to work-around. :(
   
   I personally think the schema change alone (without actual deletion vector 
feature implementation) make sense, because it's a sync-up from iceberg spec 
sync (which has already been acknowledged by the community), as the 
[PR](https://github.com/apache/iceberg/pull/11240).
   
   ## Are these changes tested?
   
   This PR is a no-op change, I confirm I could build + link with no problem.


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