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Posted to dev@flink.apache.org by "TisonKun (JIRA)" <ji...@apache.org> on 2019/06/13 02:24:00 UTC
[jira] [Created] (FLINK-12822) Add explicit transformer from
SerializableOptional to Optional
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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