SteNicholas opened a new pull request #13298:
URL: https://github.com/apache/flink/pull/13298
## What is the purpose of the change
*Method `validateAndGetChildSort` of `SortOperationFactory` checks the fetch
of `previousSort`, which doesn't support continuously fetch or limit. Indeed in
SQL perspective, Flink SQL supports continuously fetch or limit, therefore the
`fetch` and `limit` Table API also needs to support this case.
`validateAndGetChildSort` should remove the check of `previousSort` fetch.*
## Brief change log
- *Method `validateAndGetChildSort` and `createLimitWithOffset` remove the
check of `previousSort` fetch.*
## Verifying this change
- *Method `testFetch` and `testOffsetAndFetch` of `LegacyLimitITCase` add
test cases for continuously fetch or limit.*
- *Method `testOrderByFetch` of `SortITCase ` add test cases for
continuously fetch.*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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