When writing RecordBatches using ArrowStreamWriter, if the ArrowBuffers being written aren't all 8 byte aligned, the serialized RecordBatch won't conform to the Arrow specification. This leads to other languages' readers to throw an error when reading Arrow streams written by the C# writer.
For example, if reading the stream from Python or C++, an error is raised here:
A similar error is raised when Java tries to read the stream.
We should be ensuring that the buffers being written to the stream are padded to 8 bytes, no matter their length, as specified in https://arrow.apache.org/docs/format/Layout.html#requirements-goals-and-non-goals
- It is required to have all the contiguous memory buffers in an IPC payload aligned at 8-byte boundaries. In other words, each buffer must start at an aligned 8-byte offset. Additionally, each buffer should be padded to a multiple of 8 bytes.