jeyhunkarimov opened a new pull request, #24033:
URL: https://github.com/apache/flink/pull/24033
## What is the purpose of the change
The current optimizer/planner merges two Projection/Calc nodes if they are
deterministic.
In some scenarios, this check is not enough. Especially, when the top
Projection/Calc
node uses the already computed value from the bottom Project/Calc node,
merging
the two of them might lead to redundant computation (recomputing the same
expressions several times). In fact, our tests contained many tests that
computed the same expression several times.
## Brief change log
- Extend the `mergeable` method and add an additional check
- Add tests
## Verifying this change
This change added tests to `CalcMergeTestBase`
## 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)
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