Vancior opened a new pull request, #19453:
URL: https://github.com/apache/flink/pull/19453
## What is the purpose of the change
This pr introduces side output support in PyFlink DataStream API, where one
can use `yield tag, data` to push data to side stream, and use
`DataStream.get_side_output(tag)` to get the corresponding stream.
`WindowedStream.side_output_late_data(tag)` is also supported.
## Brief change log
- introduce multiple output PCollections in Beam executable stage, each
assgined to the main stream or a side output stream
- tag side output data with user tag and main stream data with default tag,
dispatch data to different PCollections according to the tag
- add `late_data_output_tag` in `WindowOperator` and yield late data with
this tag
## Verifying this change
This change added tests and can be verified as follows:
- added integration tests in test_data_stream.py and test_window.py, which
checks if main stream and side stream are correctly follow to different sinks
## 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)`: (yes)
- 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? (yes)
- If yes, how is the feature documented? (docs)
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