xuyangzhong opened a new pull request, #28354:
URL: https://github.com/apache/flink/pull/28354
## What is the purpose of the change
This pull request updates the delta join documentation to reflect new
capabilities introduced in Flink 2.3, including cascaded delta join, lookup
join after delta join, non-deterministic function support, and the immutable
columns constraint.
## Brief change log
- Added cascaded delta join, lookup join after delta join, and
non-deterministic function support to the "Supported Features" list
- Updated the limitation on non-deterministic functions to clarify it only
applies between the source and the delta join
- Changed limitations 4 and 5 to reference "upsert key" instead of "primary
key", with a footnote explaining the immutable columns constraint
- Added a hint block describing the immutable columns constraint and its
relationship to upsert key enrichment
## Verifying this change
None for doc.
## 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?
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