[jira] [Created] (FLINK-12822) Add explicit transformer from SerializableOptional to Optional

[Shang Yuanchun (Jira)]

TisonKun created FLINK-12822:
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             Summary: Add explicit transformer from SerializableOptional to Optional
                 Key: FLINK-12822
                 URL: https://issues.apache.org/jira/browse/FLINK-12822
             Project: Flink
          Issue Type: Improvement
          Components: API / Type Serialization System
    Affects Versions: 1.9.0
            Reporter: TisonKun
            Assignee: TisonKun
             Fix For: 1.9.0


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.

cc the original author [~till.rohrmann]



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