Fokko commented on code in PR #106:
URL: https://github.com/apache/iceberg-cpp/pull/106#discussion_r2101000580


##########
src/iceberg/avro/avro_schema_util.cc:
##########
@@ -263,4 +265,116 @@ Status ToAvroNodeVisitor::Visit(const SchemaField& field, 
::avro::NodePtr* node)
   return {};
 }
 
+namespace {
+
+bool HasId(const ::avro::NodePtr& parent_node, size_t field_idx,
+           const std::string& attr_name) {
+  if (field_idx >= parent_node->customAttributes()) {
+    return false;
+  }
+  return 
parent_node->customAttributesAt(field_idx).getAttribute(attr_name).has_value();
+}
+
+}  // namespace
+
+Status HasIdVisitor::Visit(const ::avro::NodePtr& node) {
+  if (!node) [[unlikely]] {
+    return InvalidSchema("Avro node is null");
+  }
+
+  switch (node->type()) {
+    case ::avro::AVRO_RECORD:
+      return VisitRecord(node);
+    case ::avro::AVRO_ARRAY:
+      return VisitArray(node);
+    case ::avro::AVRO_MAP:
+      return VisitMap(node);
+    case ::avro::AVRO_UNION:
+      return VisitUnion(node);
+    case ::avro::AVRO_BOOL:
+    case ::avro::AVRO_INT:
+    case ::avro::AVRO_LONG:
+    case ::avro::AVRO_FLOAT:
+    case ::avro::AVRO_DOUBLE:
+    case ::avro::AVRO_STRING:
+    case ::avro::AVRO_BYTES:
+    case ::avro::AVRO_FIXED:
+      return {};
+    case ::avro::AVRO_NULL:
+    case ::avro::AVRO_ENUM:
+    default:
+      return InvalidSchema("Unsupported Avro type: {}", 
static_cast<int>(node->type()));
+  }
+}
+
+Status HasIdVisitor::VisitRecord(const ::avro::NodePtr& node) {
+  static const std::string kFieldIdKey{kFieldIdProp};
+  total_fields_ += node->leaves();
+  for (size_t i = 0; i < node->leaves(); ++i) {
+    if (HasId(node, i, kFieldIdKey)) {
+      fields_with_id_++;

Review Comment:
   Ah, I see, makes sense 👍 
   
   > I think an Avro schema should be considered valid when all or none of 
fields have field-ids, but not in between.
   
   I couldn't agree more :)



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