slinkydeveloper opened a new pull request #18574:
URL: https://github.com/apache/flink/pull/18574
## What is the purpose of the change
Cleanup of previous custom ser/de for duration, and introduced jdk8 module
for ser/de
## Brief change log
* Use jdk 8 and java time modules for duration and optional ser/de
## Verifying this change
This change is a trivial rework / code cleanup without any test coverage.
## 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
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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