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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