mapleFU commented on issue #8247:
URL: https://github.com/apache/arrow-rs/issues/8247#issuecomment-3237824050
Generally, next_offset would check this:
```
thread 'main' panicked at
/home/fuxuwei/.cargo/git/checkouts/arrow-rs-91ac43a35d506e38/50a2ef3/arrow-array/src/builder/generic_bytes_builder.rs:86:57:
byte array offset overflow
stack backtrace:
0: __rustc::rust_begin_unwind
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/panicking.rs:697:5
1: core::panicking::panic_fmt
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:75:14
2: core::panicking::panic_display
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:269:5
3: core::option::expect_failed
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/option.rs:2049:5
4: core::option::Option<T>::expect
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/option.rs:958:21
5:
arrow_array::builder::generic_bytes_builder::GenericByteBuilder<T>::next_offset
at
/home/fuxuwei/.cargo/git/checkouts/arrow-rs-91ac43a35d506e38/50a2ef3/arrow-array/src/builder/generic_bytes_builder.rs:86:57
6:
arrow_array::builder::generic_bytes_builder::GenericByteBuilder<T>::append_array
at
/home/fuxuwei/.cargo/git/checkouts/arrow-rs-91ac43a35d506e38/50a2ef3/arrow-array/src/builder/generic_bytes_builder.rs:154:17
7: arrow_select::concat::concat_bytes
at
/home/fuxuwei/.cargo/git/checkouts/arrow-rs-91ac43a35d506e38/50a2ef3/arrow-select/src/concat.rs:239:9
8: arrow_select::concat::concat
at
/home/fuxuwei/.cargo/git/checkouts/arrow-rs-91ac43a35d506e38/50a2ef3/arrow-select/src/concat.rs:426:27
9: arrow_select::concat::concat_batches
at
/home/fuxuwei/.cargo/git/checkouts/arrow-rs-91ac43a35d506e38/50a2ef3/arrow-select/src/concat.rs:489:21
```
However, in some other case, it will leave negative final offset. I'll dive
into it
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