kevinjqliu commented on issue #2684:
URL: 
https://github.com/apache/iceberg-python/issues/2684#issuecomment-3482493550

   Good catch and thanks for the repro. 
   
   looks like we're not currently checking the nullability of the map itself, 
https://github.com/apache/iceberg-python/blob/5773b7f1bf2081a90a490f9d670eef804eb88ab4/pyiceberg/schema.py#L1800-L1808
   
   And the Map key is always required 
   
https://github.com/apache/iceberg-python/blob/5773b7f1bf2081a90a490f9d670eef804eb88ab4/pyiceberg/types.py#L582
   
   
   I think in java, we use the nullability of the Map value type to check 
whether the Map itself should be optional
   
https://github.com/apache/iceberg/blob/3ccb29624283bbb70cb7c70abf6855a61c29d232/api/src/main/java/org/apache/iceberg/types/CheckCompatibility.java#L237-L239


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