### Search before asking - [x] I searched in the [issues](https://github.com/apache/fluss-rust/issues) and found nothing similar. ### Description depends on https://github.com/apache/fluss-rust/pull/452 Add poll_record_batch on LogScanner and append_arrow_batch on AppendWriter for columnar data paths. ### Willingness to contribute - [ ] I'm willing to submit a PR!
