scovich commented on code in PR #8172:
URL: https://github.com/apache/arrow-rs/pull/8172#discussion_r2286705495
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parquet-variant/src/builder.rs:
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@@ -589,6 +588,7 @@ impl<S: AsRef<str>> Extend<S> for MetadataBuilder {
/// parent, and we cannot "split" a mutable reference across two objects
(parent state and the child
/// builder that uses it). So everything has to be here. Rust layout
optimizations should treat the
/// variants as a union, so that accessing a `buffer` or `metadata_builder` is
branch-free.
+#[derive(Debug)]
Review Comment:
Needed when invoking `unwrap_err` on a `Result<ObjectBuilder>` (unit test)
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