hiroyuki-sato opened a new pull request, #46319: URL: https://github.com/apache/arrow/pull/46319
### Rationale for this change There are no Extension Array/Type documentation in the [API Reference page](https://arrow.apache.org/docs/cpp/api.html). ### What changes are included in this PR? Add Extension Array / Type API documents. ### Are these changes tested? No. (Add document only) ### Are there any user-facing changes? No. -- 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]
