hiroyuki-sato opened a new issue, #46318: URL: https://github.com/apache/arrow/issues/46318
### Describe the enhancement requested There are no Extension Array/Type documentation in the [API Reference page](https://arrow.apache.org/docs/cpp/api.html). ### 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: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
