[57_maintenance] Prevent ArrayData validation length overflow (#9816) - #9925
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# Which issue does this PR close? - None. # Rationale for this change `ArrayData` validation used unchecked `usize` arithmetic when combining array lengths and offsets. In optimized builds, very large lengths could wrap these calculations and allow invalid `ArrayData` metadata to pass validation. # What changes are included in this PR? This adds checked arithmetic for length plus offset calculations in `ArrayData` validation, including offset-buffer validation and related typed-buffer sizing paths. # Are these changes tested? Yes. This adds regression coverage for overflowing offset-buffer and typed-buffer length calculations. Validated with: ```bash cargo test -p arrow-data overflow --release ``` # Are there any user-facing changes? Invalid `ArrayData` whose length and offset cannot be represented without overflow now returns an validation error consistently across build modes. There are no API changes.
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57.3.1(May 2026) #9858This PR:
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