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https://issues.apache.org/jira/browse/FLINK-12822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Till Rohrmann resolved FLINK-12822.
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Resolution: Done
Done via 27a1c415d39d07790c322fe12d7c4e8075477cea
> 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
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Attachments: FLINK-12822.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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