c-thiel commented on code in PR #615:
URL: https://github.com/apache/iceberg-rust/pull/615#discussion_r1774977970
##########
crates/iceberg/src/spec/schema.rs:
##########
@@ -943,6 +965,122 @@ impl SchemaVisitor for PruneColumn {
}
}
+struct ReassignFieldIds {
+ next_field_id: i32,
+ old_to_new_id: HashMap<i32, i32>,
+}
+
+// We are not using the visitor here, as post order traversal is not desired.
+// Instead we want to re-assign all fields on one level first before diving
deeper.
+impl ReassignFieldIds {
+ fn new(start_from: i32) -> Self {
+ Self {
+ next_field_id: start_from,
+ old_to_new_id: HashMap::new(),
+ }
+ }
+
+ fn reassign_field_ids(&mut self, fields: Vec<NestedFieldRef>) ->
Vec<NestedFieldRef> {
+ // Visit fields on the same level first
+ let outer_fields = fields
+ .into_iter()
+ .map(|field| {
+ self.old_to_new_id.insert(field.id, self.next_field_id);
Review Comment:
I added the check. It should never trigger currently, because I switched the
build method order as you suggested.
Nevertheless the check is good if Reassignment is ever used outside of the
builder in the future.
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