anoopj commented on code in PR #2966:
URL: https://github.com/apache/iceberg-rust/pull/2966#discussion_r3744922776
##########
crates/iceberg/src/arrow/record_batch_transformer.rs:
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@@ -235,6 +256,11 @@ pub(crate) enum ColumnConstant {
/// A struct constant (the `_partition` column). Each child is a primitive
constant
/// or null (for partition evolution gaps).
Struct(StructConstant),
+ /// An all-null metadata column. Used when a metadata column resolves to
null
+ /// (e.g. `_last_updated_sequence_number` for a file with a null
`first_row_id`).
+ /// The field id is the map key. A distinct variant (rather than `Scalar`
with a
+ /// null value) because `Datum` always represents a non-null value.
+ Null,
Review Comment:
Done.
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