Au-Miner opened a new pull request, #28267:
URL: https://github.com/apache/flink/pull/28267
## What is the purpose of the change
Add restore tests for cascaded (3-table) delta join scenarios to ensure
state compatibility across versions when upgrading from
`stream-exec-delta-join` version 1 to version 2.
## Brief change log
- Add 7 new cascaded delta join test programs in `DeltaJoinTestPrograms`
covering join-key-equals-index, join-key-contains-index, non-equiv-condition,
calc-on-source, filter-pushed-down, cache, and cache-with-calc-on-source.
- Register the new programs in `DeltaJoinRestoreTest#programs()` and
override `programsToIgnore()` to skip cascaded programs for version 1 (only
supported from version 2).
- Add corresponding JSON plan files and savepoint `_metadata` under
`restore-tests/stream-exec-delta-join_2/`.
## Verifying this change
This change itself adds restore tests. The new test programs are exercised
by `DeltaJoinRestoreTest` which validates that a job restored from a version-2
savepoint produces the expected materialized output for each cascaded delta
join variant.
## 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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