lostluck opened a new issue, #22397: URL: https://github.com/apache/beam/issues/22397
### What would you like to happen? There's been a quiet request to have windows also be providable to CombineFn methods. Very similar to key aware CombineFns in issue #22211 in that it would require expanding permitted parameter orderings for combine methods, and ensuring they are properly populated at execution time. Combiners are already implicitly window aware, so there's no change in performance as a result of this. For both issues, the generic `register.Combine` methods would need to be expanded accordingly to handling the additional parameters to the methods, when present. Example use case is being able to have the accumulator extract time bounds information from the window, such as for hooking into OpenTelemetry metrics downstream. ### Issue Priority Priority: 2 ### Issue Component Component: sdk-go -- 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]
