c-thiel commented on code in PR #2188:
URL: https://github.com/apache/iceberg-rust/pull/2188#discussion_r3363120101
##########
crates/iceberg/src/spec/schema/mod.rs:
##########
@@ -421,6 +425,85 @@ impl Schema {
pub fn field_id_to_fields(&self) -> &HashMap<i32, NestedFieldRef> {
&self.id_to_field
}
+
+ /// Minimum [`FormatVersion`] required to represent all *types* in this
schema.
+ ///
+ /// Types only; for initial-default version floors see
[`Schema::check_format_compatibility`].
+ pub fn min_format_version(&self) -> FormatVersion {
+ // `id_to_field` is flattened, so the max over all fields covers
nested ones too.
+ self.id_to_field
+ .values()
+ .map(|f| leaf_min_format_version(&f.field_type))
+ .max()
+ .unwrap_or(FormatVersion::V1)
+ }
+
+ /// Returns an error listing every field incompatible with
`format_version`.
+ /// Mirrors Java's `Schema.checkCompatibility()`. Two checks per field:
+ ///
+ /// - **Type** — per `leaf_min_format_version`.
Review Comment:
https://github.com/apache/iceberg-rust/pull/2188/commits/15884b99c2faffd770c00865280bbe574b0c526e
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