beyond1920 opened a new pull request #16025:
URL: https://github.com/apache/flink/pull/16025
## What is the purpose of the change
In theory, `StreamPhysicalWindowTableFunction` should works as a window
assigner and emits at ends of window. However,
`StreamPhysicalWindowTableFunction` could be simplified to a simple window
assigner, and emits per record if it's successor node is one of
`WindowRank`/`WindowJoin`/`WindowAggregate` with
`WindowAttachedWindowingStrategy`, because those nodes would assign input
records to windows have been assigned in input nodes, and trigger emit at ends
of window.
Besides, we should add a limit that window is based on rowtime, because it
has syntax problem if window is assigned based on the proc-time of previous
operator.
The pr introduce a rule to simplify window-tvf.
## Brief change log
- Introduce `SimplifyWindowTableFunctionRule`
- Add a flag in `StreamPhysicalWindowTableFunction` to specify whether it
is a simplify window tvf.
## Verifying this change
- existed UT in `WindowRankTest` and `WindowJoinTest`
## 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? (no)
- If yes, how is the feature documented? (not applicable)
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