JingGe opened a new pull request #17888:
URL: https://github.com/apache/flink/pull/17888
## What is the purpose of the change
try to fix some unstable failing tests.
## Brief change log
- add check of row count after insert
- explicitly call await() for batch select
## Verifying this change
This change is a trivial rework / test case improvement.
## 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, 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**)
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