jvanstraten commented on code in PR #13468:
URL: https://github.com/apache/arrow/pull/13468#discussion_r912346263


##########
cpp/src/arrow/engine/substrait/type_internal.cc:
##########
@@ -196,10 +196,11 @@ Result<std::pair<std::shared_ptr<DataType>, bool>> 
FromProto(
           field("value", std::move(value_nullable.first), 
value_nullable.second));
     }
 
-    case ::substrait::Type::kUserDefinedTypeReference: {
-      uint32_t anchor = type.user_defined_type_reference();
+    case ::substrait::Type::kUserDefined: {
+      const auto& user_defined = type.user_defined();
+      uint32_t anchor = user_defined.type_reference();
       ARROW_ASSIGN_OR_RAISE(auto type_record, ext_set.DecodeType(anchor));
-      return std::make_pair(std::move(type_record.type), true);
+      return std::make_pair(std::move(type_record.type), 
IsNullable(user_defined));

Review Comment:
   I think @bkietz just set it to true in the initial PR because nullable types 
are the default in Arrow and he had nowhere to get the flag from.



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