Au-Miner opened a new pull request, #28882:
URL: https://github.com/apache/flink/pull/28882
## What is the purpose of the change
This change fixes an optimizer issue where adjacent Calc nodes created by
watermark transposition prevent unused fields from being projected out on the
input side of `ChangelogNormalize`. This unnecessarily increases the shuffle
row width and `ChangelogNormalize` state size.
## Brief change log
- Add `FlinkCalcMergeRule.STREAM_PHYSICAL_INSTANCE` to
`CHANGELOG_NORMALIZE_TRANSPOSE_RULES` so that Calc nodes created by
`WatermarkAssignerChangelogNormalizeTransposeRule` are merged before
`PushCalcPastChangelogNormalizeRule` runs.
- Add `testPushdownCalcNotAffectChangelogNormalizeKey2` to
`WatermarkAssignerChangelogNormalizeTransposeRuleTest`.
## Verifying this change
`WatermarkAssignerChangelogNormalizeTransposeRuleTest#testPushdownCalcNotAffectChangelogNormalizeKey2`
verifies that only the required field `f` and the `ChangelogNormalize` key `a`
are projected to its input side. The rowtime field `ingestion_time` remains
available to `WatermarkAssigner` without entering the shuffle or
`ChangelogNormalize` state.
## 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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