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https://issues.apache.org/jira/browse/FLINK-3001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000181#comment-15000181
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Fabian Hueske commented on FLINK-3001:
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Do we want to support Option types as keys?
If yes, what will be the Null semantics of Option types?
- Are two null-valued Options equal?
- Do null valued Options sort before or after non-null valued Options?
> Add Support for Java 8 Optional type
> ------------------------------------
>
> Key: FLINK-3001
> URL: https://issues.apache.org/jira/browse/FLINK-3001
> Project: Flink
> Issue Type: New Feature
> Components: Java API
> Affects Versions: 0.10
> Reporter: Stephan Ewen
> Priority: Minor
> Fix For: 1.0
>
>
> Using {{Optional}} is a good way to handle nullable fields.
> The missing support for null fields in tuples can be easily handled by using
> {{Optional<T>}} for nullable fields and {{T}} directly for non nullable
> fields.
> That also retains best serialization efficiency.
> Since we cannot always assume the presence of {{Optional}} (only introduced
> in Java8), the TypeExtractor needs to analyze and create that TypeInfo with
> reflection.
> Further more, we need to add the OptionalTypeInfo to the flink-java8 project
> and people need to include flink-java8 in their project if they want to use
> the Optional.
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