adamreeve opened a new issue, #41198: URL: https://github.com/apache/arrow/issues/41198
### Describe the bug, including details regarding any error messages, version, and platform. The `ArrayDataConcatenator` does not currently handle union arrays correctly. It concatenates type and offset buffers without accounting for array lengths, and the way it calculates the `baseOffset` in `ConcatenateUnionOffsetBuffer` has an off-by-one error and doesn't account for offsets being different per type. I've made union array comparison more thorough in #41197, which caused the array concatenation tests to start failing, so I've temporarily skipped testing of union array concatenation in that PR. ### Component(s) C# -- 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]
