pitrou opened a new issue, #45821: URL: https://github.com/apache/arrow/issues/45821
### Describe the enhancement requested The Grouper API could be useful for functionality such as Pivot. However, it lacks the following functionality: 1. ability to prepopulate the grouper without necessarily returning group ids 2. ability to lookup keys without generating new groups for keys that haven't been encountered yet ### 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
