friendlymatthew commented on code in PR #7906:
URL: https://github.com/apache/arrow-rs/pull/7906#discussion_r2201810926
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parquet-variant/src/variant/object.rs:
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@@ -242,6 +242,8 @@ impl<'m, 'v> VariantObject<'m, 'v> {
} else {
// The metadata dictionary can't guarantee uniqueness or
sortedness, so we have to parse out the corresponding field names
// to check lexicographical order
+ //
+ // Since we are probing the metadata dictionary by field id,
this also verifies field ids are in-bounds
let are_field_names_sorted = field_ids
.iter()
Review Comment:
> We only make a single pass now, so we no longer need to collect field ids
into a vec. The only non-trivial tweak is to request the last field id
specifically for the field id bounds check -- O(1) cost, so no need to
materialize a whole just vec for that.
Hm, I'm a bit confused why we'd need to request the last field id? The
bounds check occurs when mapping through field ids and requesting the field
name via the metadata dictionary by id.
Since `metadata.get(i)` returns a `Result<&str>`, I'll need to do a try_fold
here. Might make it a bit harder to reason through, but I'll push something up
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