scovich commented on code in PR #7915:
URL: https://github.com/apache/arrow-rs/pull/7915#discussion_r2205812903
##########
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:
Observation: I think the `Variant::ShreddedObject` is mostly (only?) useful
on the read (unshredding) path; a writer who wants to produce shredded variant
almost certainly doesn't want to work with this API because it's ultimately
just a collection of variant values that were probably strongly typed at first
and now have to pay a round trip through a `Variant`? Shredding would be able
to consume these objects, e.g. if re-shredding something that was previously
shredded, but it's not the preferred approach for turning e.g. a `StructArray`
directly into `VariantArray`.
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