wanglijie95 opened a new pull request, #23216: URL: https://github.com/apache/flink/pull/23216
## What is the purpose of the change Currently, runtime filter program will try to look for an Exchange as build side to avoid affecting MultiInput. It will try to push down the runtime filter builder if the original build side is not Exchange. Currenlty, the builder-push-down does not aware the join type, which may lead to incorrect results(For example, push down the builder to the right input of left-join). We should only support following cases: 1. Inner join: builder can push to left + right input 2. semi join: builder can push to left + right input 3. left join: builder can only push to the left input 4. right join: builder can only push to the right input ## Verifying this change Add test `testBuildSideIsLeftJoinWithoutExchange` ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (**no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (**no**) - The serializers: (**no**) - The runtime per-record code paths (performance sensitive): (**no**) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (**no**) - The S3 file system connector: (**no**) ## Documentation - Does this pull request introduce a new feature? (**no**) - If yes, how is the feature documented? (**not applicable**) -- 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...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org