snuyanzin opened a new pull request, #26780:
URL: https://github.com/apache/flink/pull/26780
## What is the purpose of the change
There is a number of cases when changelog normalise node can be reused if
source is same
for instance
```sql
SELECT * FROM T WHERE f1 > 0
UNION
SELECT * FROM T WHERE f1 < 10
```
more examples could be found in tests
## Verifying this change
PushCalcPastChangelogNormalizeRuleTest
## 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)
- If yes, how is the feature documented? (not applicable )
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