K-ballo opened a new issue, #49928: URL: https://github.com/apache/arrow/issues/49928
### Describe the bug, including details regarding any error messages, version, and platform. In Arrow 24.0.0, `parquet::TypedColumnWriterImpl::UpdateLevelHistogram` can construct a `std::span` from a null pointer, causing immediate UB and crashes in libstdc++: https://github.com/apache/arrow/blob/9a0afd9e9545444b492237cc9db7eb4549ce09f5/cpp/src/parquet/column_writer.cc#L1810-L1825 Seen with `rep_levels == nullptr`, `num_levels == 3`, and `max_level == 0`. Note the `max_level == 0` guard inside the lambda is too late to protect from UB while constructing the `std::span` argument. ### Component(s) Parquet -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
