nssalian commented on code in PR #2188:
URL: https://github.com/apache/iceberg-rust/pull/2188#discussion_r3326627871
##########
crates/iceberg/src/spec/schema/mod.rs:
##########
@@ -421,6 +422,56 @@ impl Schema {
pub fn field_id_to_fields(&self) -> &HashMap<i32, NestedFieldRef> {
&self.id_to_field
}
+
+ /// Returns the minimum [`FormatVersion`] required to represent all types
in this schema.
+ ///
+ /// Iterates over every field and returns the highest minimum version
among them,
+ /// defaulting to `FormatVersion::V1` if all types are universally
supported.
+ pub fn min_format_version(&self) -> FormatVersion {
+ self.id_to_field
+ .values()
+ .map(|f| f.field_type.min_format_version())
+ .max()
+ .unwrap_or(FormatVersion::V1)
+ }
+
+ /// Check that all types in this schema are supported by the given format
version.
+ ///
+ /// Mirrors Java's `Schema.checkCompatibility()`. Returns an error listing
every
Review Comment:
Accuracy fix on the doc comment: this says it "Mirrors Java's
Schema.checkCompatibility()", but Java's version also rejects a non-null
initial-default when formatVersion < 3, which isn't checked here (iceberg-go
[#932](https://github.com/apache/iceberg-go/pull/932) guards variant defaults
too). Could we narrow it to "Mirrors the type-version portion of Java's
Schema.checkCompatibility()" so it doesn't read as full parity? Adding the
actual default check is fine as a follow-up.
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