TsReaper opened a new pull request #12750:
URL: https://github.com/apache/flink/pull/12750
## What is the purpose of the change
Currently CollectResultIterator will only output results after a checkpoint
in streaming mode. It will be strange for users who does not enable
checkpointing to stuck forever when using the iterator without further notice.
As 1.11 is about to release, we shall at least throw an exception notifying
the user to enable checkpointing. We'll support iterators with at least once
semantics or exactly once semantics without fault tolerance in the future.
## Brief change log
- CollectResultIterator now throws exception if user does not enable
checkpointing in streaming mode
## Verifying this change
This change is already covered by existing tests, such as
`TableEnvironmentITCase`.
This change can also be verified by newly added tests in
`TableEnvironmentTest`.
## 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/Mesos, 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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