autophagy opened a new pull request, #28367:
URL: https://github.com/apache/flink/pull/28367
## What is the purpose of the change
Currently, if you use a limit without an order, like `env.fromValues("Hello
world!").limit(1)` and try to produce the SQL equivalent via
`.getQueryOperation().asSerializableString()`, you get an invalid SQL string
that contains an `ORDER BY` clause with no column/s.
This PR fixes the SQL serialization of `SortQueryOperation` in cases where
no order is given.
## Brief change log
- Fixed SQL serialization of `SortQueryOperation` in cases where no order is
given.
## Verifying this change
This change added tests and can be verified as follows:
- Serialization test in `QueryOperationTestPrograms.java` for a `limit()`
without an `orderBy()`.
## 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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