hinxx opened a new issue, #34262: URL: https://github.com/apache/arrow/issues/34262
### Describe the enhancement requested I've built an union manually with `pa.UnionArray.from_dense()`, not using inference, In python I'm trying to write that union to an ORC file and I'm getting the following error: ``` pyarrow.lib.ArrowNotImplementedError: Unknown or unsupported Arrow type: dense_union<int64: int64=0, float64: double=1, string: string=2> ``` It seems that this in not supported even in C++ code that, IMO, python uses: https://github.com/apache/arrow/blob/f2d632e727d4eb7e8a693354c9116ea2518e50a6/cpp/src/arrow/adapters/orc/util.cc#L920 Any plans on adding this feature to arrow? ### Component(s) C++, Python -- 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]
