Stephan Ewen created FLINK-3001:
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Summary: 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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