[jira] [Updated] (FLINK-15674) Let Java and Scala Type Extraction go through the same stack

["Aljoscha Krettek (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-15674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-15674:
-------------------------------------
    Priority: Major  (was: Critical)

> Let Java and Scala Type Extraction go through the same stack
> ------------------------------------------------------------
>
>                 Key: FLINK-15674
>                 URL: https://issues.apache.org/jira/browse/FLINK-15674
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / DataStream
>            Reporter: Stephan Ewen
>            Assignee: Guowei Ma
>            Priority: Major
>              Labels: usability
>
> Currently, the Java and Scala Type Extraction stacks are completely different.
> * Java uses the {{TypeExtractor}}
> * Scala uses the type extraction macros.
> As a result, the same class can be extracted as different types in the different stacks, which can lead to very confusing results. In particular, when you use the TypeExtractor on Scala Classes, you always get a {{GenericType}}.
> *Suggestion for New Design*
> There should be one type extraction stack, based on the TypeExtractor.
> * The TypeExtractor should be extensible and load additions through service loaders, similar as it currently loads Avro as an extension.
> * The Scala Type Extraction logic should be such an extension.
> * The Scala Marcos would only capture the {{Type}} (as in Java type), meaning {{Class}}, or {{ParameterizedType}}, or {{Array}} (etc.) and delegate this to the TypeExtractor.



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