pitrou commented on PR #48717:
URL: https://github.com/apache/arrow/pull/48717#issuecomment-3742846547
> **The bug is manifestable through the public `WriteBatch` API.** When
users call:
>
> ```c++
> ByteArray empty{0, nullptr};
> writer->WriteBatch(n, nullptr, nullptr, &empty);
> ```
Why is this correct? I'm not sure it is ok to pass a nullptr ByteArray to
WriteBatch. Also, if you pass `n` for length, you need `n` ByteArray values,
not a single one...
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