AdvancedUno opened a new pull request, #50353:
URL: https://github.com/apache/arrow/pull/50353
### Rationale for this change
`KeyValueMetadata::DeleteMany` crashes (out-of-bounds write) when the
indices vector
contains duplicates, e.g. `DeleteMany({0, 0})`. The compaction loop
increments its `shift`
counter once per entry, so duplicates cause writes at negative offsets.
Additionally, out-of-range indices were only checked by `DCHECK`, so in
release builds
`DeleteMany({size})` silently deleted the last element and negative indices
were UB.
### What changes are included in this PR?
- `DeleteMany` now validates indices after sorting and returns
`Status::IndexError` for
any index out of `[0, size)`, matching the behavior and message format of
`Delete`.
Metadata is left unmodified on error.
- Duplicate indices are removed with `std::unique` before compaction, so
deleting the
same index twice is equivalent to deleting it once.
### Are these changes tested?
Yes — added cases to `KeyValueMetadataTest.Delete` covering duplicate indices
(`{0,0}`, `{1,3,1,3,1}`), out-of-bounds positive and negative indices (exact
error
messages), and that metadata is unchanged after a failed call.
### Are there any user-facing changes?
Yes, minor behavioral fix: `DeleteMany` now returns `IndexError` for
out-of-range indices
instead of crashing (duplicates) or silently corrupting state (release
builds). No API change.
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