kevinjqliu opened a new pull request, #3816:
URL: https://github.com/apache/iceberg-python/pull/3816

   Closes #2467
   
   # Rationale for this change
   
   After a schema update, upsert could read matching rows with the schema 
stored on the current snapshot rather than the updated table schema. File 
planning remains scoped to the target branch, while rows are projected using 
the current transaction schema.
   
   ## Are these changes tested?
   
   Yes. Added regression coverage for main and a diverged branch. The full test 
suite and lint checks pass.
   
   ## Are there any user-facing changes?
   
   Yes. Upsert works after adding a column.


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