fhueske opened a new pull request, #28329:
URL: https://github.com/apache/flink/pull/28329
## What is the purpose of the change
Stateful keyed two-input operator backing LATERAL SNAPSHOT joins.
* Two phases (LOAD/JOIN) gated by an operator UnionListState; mixed-phase
rescale collapses to LOAD. Flip triggers: build-side WM reaches
loadCompletedTime, or a processing-time idle-timeout fallback.
* Probe records are buffered in LOAD and joined on flip. Build-side changes
are buffered per-key and applied lazily in event-time order on the next per-key
access once the build-side WM advanced, preserving atomic -U/+U visibility.
* Watermarks: build-side absorbed; probe-side held back in LOAD, forwarded
in JOIN. NULL equi-keys filtered via JoinConditionWithNullFilters.
* State TTL via keyed processing-time timers with a post-flip grace window;
rearms are amortized so effective time-to-eviction is in [1.0×, 1.5×]
stateTtlMs.
## Brief change log
* add `LateralSnapshotJoinOperator` according to FLIP-579
## Verifying this change
* `LateralSnapshotJoinOperatorTest`
## 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): yes
- 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 (operator is not
accessible yet)
- If yes, how is the feature documented? n/a
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes (please specify the tool below)
Co-authored-by: Claude Code 2.1.148 (Opus 4.7)
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