bug: arrow offset overflow

Description

I'm seeing some compactions fail with LanceError(Arrow): Offset overflow error: N, where N is always just over i32::MAX (observed ~ 2,150M). I've seen it come from 2 sites, both in the decode path where arrow_select::concat::concat stitches decoded pages into a single Arrow array: CompositeDecodeTask::decode at lance-encoding/src/array_encoding/logical/struct.rs:594 and StructuralCompositeDecodeArrayTask::decode at lance-encoding/src/encodings/logical/primitive.rs:4501 (and :4367). When one compaction's input carries more than 2 GiB of variable-width data in a single i32-offset column (Utf8/Binary/List), the concat overflows and the task fails. I've seen this on both lance 11.0.0-beta.22 and 12.0.0-beta.16;

Steps to reproduce

I can provide sample data that reproduces this, but it's too big to share here immediately.

Expected behavior

No response

Lance version

11.0.0-beta.22

Language binding

Rust

Environment

No response

Logs / traceback

Start in lance-encoding/src/array_encoding/logical/struct.rs at CompositeDecodeTask::decode:594 and lance-encoding/src/encodings/logical/primitive.rs at StructuralCompositeDecodeArrayTask::decode:4367 and :4501. Reproduce with variable-width Utf8, Binary, or List data exceeding 2 GiB in one i32-offset column, using the reporter's sample data when available. Done means compaction no longer fails with Arrow offset overflow and the regression is covered by a test.