advancedxy commented on code in PR #2668:
URL: https://github.com/apache/iceberg-rust/pull/2668#discussion_r3472314907


##########
crates/iceberg/src/arrow/record_batch_transformer.rs:
##########
@@ -140,6 +154,13 @@ pub(crate) enum ColumnSource {
         target_type: DataType,
         value: Option<PrimitiveLiteral>,
     },
+
+    // A struct column where each child is a constant primitive value.
+    // Used for the _partition metadata column.
+    AddStructConstant {

Review Comment:
   Thanks for logging the issue.
   
   I was wondering if we can simply use `Struct` type for child _values? It's 
not required, I'm ok to do that in follow-up.



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