aljoscha opened a new pull request #14489: URL: https://github.com/apache/flink/pull/14489
## Brief change log - add the fix - add tests for `BatchGroupedReduceOperator` ## Verifying this change - newly added tests ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
