scovich commented on code in PR #7906:
URL: https://github.com/apache/arrow-rs/pull/7906#discussion_r2201728155
##########
parquet-variant/src/variant/metadata.rs:
##########
@@ -268,6 +261,16 @@ impl<'m> VariantMetadata<'m> {
"dictionary values are not unique and
ordered".to_string(),
));
}
+ } else {
+ // Validate offsets are in-bounds and monotonically increasing.
+ // Since shallow validation ensures the first and last offsets
are in bounds, we can also verify all offsets
+ // are in-bounds by checking if offsets are monotonically
increasing.
+ let are_offsets_monotonic = offsets.is_sorted_by(|a, b| a < b);
+ if !are_offsets_monotonic {
Review Comment:
not sure the extra `let` is helpful?
```suggestion
if !offsets.is_sorted_by(|a, b| a < b) {
```
##########
parquet-variant/src/variant/metadata.rs:
##########
@@ -237,22 +237,15 @@ impl<'m> VariantMetadata<'m> {
let offsets =
map_bytes_to_offsets(offset_bytes,
self.header.offset_size).collect::<Vec<_>>();
Review Comment:
Are we still tracking a TODO to eliminate this materialization?
Once the comment below is addressed, I _think_ it's the only one left.
##########
parquet-variant/src/variant/object.rs:
##########
@@ -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.
While you're at it, consider replacing the `collect` + `is_sorted` pair just
below with just `Iterator::is_sorted`?
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