alamb commented on code in PR #7915:
URL: https://github.com/apache/arrow-rs/pull/7915#discussion_r2202881293
##########
parquet-variant/src/builder.rs:
##########
@@ -350,14 +378,59 @@ impl<S: AsRef<str>> FromIterator<S> for MetadataBuilder {
}
}
-impl<S: AsRef<str>> Extend<S> for MetadataBuilder {
+impl<S: AsRef<str>> Extend<S> for DefaultMetadataBuilder {
fn extend<T: IntoIterator<Item = S>>(&mut self, iter: T) {
for field_name in iter {
self.upsert_field_name(field_name.as_ref());
}
}
}
+/// Read-only metadata builder that validates field names against an existing
metadata dictionary
Review Comment:
I don't really understand the usecase for ReadOnlyMetadataBuilder? If a
shredded variant is already guaranteed to have the correct field names, it
means we don't need to update the variant or build a new one so I am not sure
even how a VariantBuilder would be involved 🤔
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