beliefer opened a new pull request, #26359:
URL: https://github.com/apache/flink/pull/26359
## What is the purpose of the change
This PR aims to improve the method `flatten` of class `GlobalConfiguration`.
Currently, the method `flatten` of class `GlobalConfiguration` adopts the
recursion to flatten the nested or multi-level map to flattened, 1 level deep
map.
Every time method `flatten` is entered, a new map is created.
We can avoid the duplication of create map.
## Brief change log
Improve the method `flatten` of class `GlobalConfiguration`.
## Verifying this change
This change is already covered by existing tests, such as
*(YamlParserUtilsTest)*.
## 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? (JavaDocs)
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