AHeise opened a new pull request, #26699:
URL: https://github.com/apache/flink/pull/26699
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## What is the purpose of the change
Transformations are immutable by design and thus planner or DataStream API
need to generate a subgraph in one pass. However, there are some use cases
where we would attach some small subgraph to a larger subgraph before
translation into a StreamGraph. For example, system views in SQL may actually
refer to specific parts of the query where we would like to add a subgraph to a
side-output.
This commit adds StubTransformation that is later connected to an existing
Transformation by defining a predicate to find the upstream transformations to
which to connect the downstream transformations.
## Brief change log
- Adds TransformationTranslator.Context#getTransformations
- Adds StubTransformation(Translation)
## Verifying this change
Added unit tests in StreamGraphGeneratorTest.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (**yes** / no)
- If yes, how is the feature documented? (not applicable / docs /
**JavaDocs** / not documented)
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