danny0405 opened a new pull request #13623:
URL: https://github.com/apache/flink/pull/13623
## What is the purpose of the change
This patch introduces `WindowJoinOperator` and `WindowJoinOperatorSimple`,
The `WindowJoinOperator` accepts two streams and windows each stream, when
watermark passes and triggers each window, it joins the dataset of the
two stream windows and emit the results. Note that the operator itself
generates the window attributes.
The `WindowJoinOperatorSimple` is a simpler version of `WindowJoinOperator`,
it assumes that all the inputs has window attributes(e.g. window_start
and window_end), so there is no need for windowing again.
## Brief change log
- Add two operators, `WindowJoinOperator` and `WindowJoinOperatorSimple`
- Refactor the table window process functions so that to reuse
- Add test cases
## Verifying this change
Added UTs.
## 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/Mesos, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? not documented
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