hcrosse opened a new pull request, #3998:
URL: https://github.com/apache/iceberg-python/pull/3998

   # Rationale for this change
   
   An explicit `snapshot_id=0` falls back to the current snapshot during local 
scan planning. It can also be overridden by `use_ref()`, unlike other explicit 
snapshot IDs. Distinguish zero from `None` in both checks.
   
   This follows the earlier zero-ID fix in #249 (related issue #232), which 
covered `Table.current_snapshot()` but not these scan paths.
   
   ## Are these changes tested?
   
   Added regression tests for zero-ID selection, a missing zero-ID snapshot, 
and ref override rejection, with default and nonzero controls. The zero-ID 
cases fail before the fix and pass afterward. The full unit suite and `make 
lint` pass on Python 3.12.
   
   ## Are there any user-facing changes?
   
   Scans explicitly selecting snapshot zero now resolve that snapshot rather 
than the current snapshot. `use_ref()` rejects overriding that explicit 
selection, consistently with nonzero snapshot IDs.
   


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