advancedxy commented on code in PR #1006:
URL: https://github.com/apache/iceberg-cpp/pull/1006#discussion_r4258196774


##########
src/iceberg/parquet/parquet_data_util.cc:
##########
@@ -147,15 +164,17 @@ Result<std::shared_ptr<::arrow::Array>> 
ProjectStructArray(
       if (projected_field.type()->is_nested()) {
         const auto& nested_type =
             internal::checked_cast<const NestedType&>(*projected_field.type());
+        // Metadata columns belong to top-level rows; nested fields need no 
positions.
         ICEBERG_ASSIGN_OR_RAISE(
             projected_array,
             ProjectNestedArray(parquet_array, output_arrow_type, nested_type,
-                               field_projection.children, metadata_context, 
pool));
+                               field_projection.children, metadata_context,
+                               /*row_positions=*/nullptr, pool));

Review Comment:
   not satisfied about these nullptr changes yet, however I don't find a more 
elegant way to passing row positions as it will touch all the 
ProjectedXXXMethods.
   
   happy to take suggestions. 



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