pitrou opened a new issue, #47918: URL: https://github.com/apache/arrow/issues/47918
### Describe the bug, including details regarding any error messages, version, and platform. The Flatbuffers spec [stipulates](https://github.com/apache/arrow/blob/8dd9eba99a69dbdf1d110cebf0bd349ee3ac7eda/format/Message.fbs#L59-L65) that every compressed buffer should be prefixed with the 8-byte uncompressed length. However, in the C++ IPC writer, we actually write an empty compressed buffer (without length prefix) if the uncompressed data is empty: https://github.com/apache/arrow/blob/8dd9eba99a69dbdf1d110cebf0bd349ee3ac7eda/cpp/src/arrow/ipc/writer.cc#L243-L246 and, of course, we also handle this case in the C++ IPC reader: https://github.com/apache/arrow/blob/8dd9eba99a69dbdf1d110cebf0bd349ee3ac7eda/cpp/src/arrow/ipc/reader.cc#L513-L515 We should make it clear in the Flatbuffers spec that this case is allowed. ### Component(s) Format -- 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]
