[jira] [Commented] (FLINK-3001) Add Support for Java 8 Optional type

["Fabian Hueske (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000181#comment-15000181 ] 

Fabian Hueske commented on FLINK-3001:
--------------------------------------

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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