[GitHub] [flink] TisonKun opened a new pull request #8724: [FLINK-12822][apis] Add explicit transformer from SerializableOptional to Optional

[GitBox <gi...@apache.org>]

TisonKun opened a new pull request #8724: [FLINK-12822][apis] Add explicit transformer from SerializableOptional to Optional
URL: https://github.com/apache/flink/pull/8724
 
 
   ## What is the purpose of the change
   
   We introduce `SerializableOptional` to represent return value that of `Optional` and transported cross network.
   
   The purpose is reasonable. However, a wart is inside `SerializableOptional`. Calling `SerializableOptional#map` will returns a `Optional`, which might surprise contributors if they want to chain operations and get a `SerializableOptional` as final result(to another transport maybe).
   
   Semantically return value of `SerializableOptional#map` should be `SerializableOptional`, and for interoperation, we could introduce a `SerializableOptional#toOptional` which easily adapt to the correct type.
   
   ## Brief change log
   
   - Change return type of `SerializableOptional#map` to `SerializableOptional`
   - Add method `SerializableOptional#toOptional`
   - Adapt invocations.
   
   
   ## Verifying this change
   
   This change is a trivial rework 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)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, 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)
   
   cc @tillrohrmann 
   

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