fhueske opened a new pull request, #29098:
URL: https://github.com/apache/flink/pull/29098
## What is the purpose of the change
Add an explicit `on_time` DESCRIPTOR argument to the SNAPSHOT function that
names the build-side row-time column. It replaces the implicit row-time
inference: the argument is optional on the signature but required for streaming
queries, and the planner resolves its field index and threads it through to the
operator.
Because `on_time` is a reserved system-argument name, SNAPSHOT declares it
while keeping the automatic system arguments disabled, and naming the column
keeps a watermark hidden from SELECT * by column expansion available to the
join. The LATERAL SNAPSHOT documentation is updated accordingly.
## Brief change log
* add an `on_time` attribute to SNAPSHOT function to specify a rowtime
attribute on the build-side input
* pass index of rowtime attribute into join operator
* operator implementation did not change
* change handling of PTF system-args
* PTFs that disable system-args can now overwrite them (have args that are
named like system-args)
* add just tests and documentation
## Verifying this change
Run existing and new tests.
## 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? yes
- If yes, how is the feature documented? Adjusted the docs
---
##### Was generative AI tooling used to co-author this PR?
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Generated-by: Claude Opus 4.8 (1M context)
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