xndai opened a new pull request, #17609:
URL: https://github.com/apache/iceberg/pull/17609

   null_value_count was documented as only used for optional fields, but a 
required field nested within an optional struct is null whenever an ancestor 
value is null. Add definition of nullability by the full path from root, scope 
the required-field contract to a present enclosing struct, and require readers 
to rely on null_value_count == 0 rather than the required flag.


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