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ASF GitHub Bot commented on FLINK-6457:
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twalthr commented on issue #3880: [FLINK-6457] [table] Clean up ScalarFunction
and TableFunction interface
URL: https://github.com/apache/flink/pull/3880#issuecomment-439417094
I also agree with @fhueske. I will close this PR for now. The affected
classes might be ported to Java soon anyway due to FLINK-10689.
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> Clean up ScalarFunction and TableFunction interface
> ---------------------------------------------------
>
> Key: FLINK-6457
> URL: https://issues.apache.org/jira/browse/FLINK-6457
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Ruidong Li
> Assignee: Ruidong Li
> Priority: Major
> Labels: pull-request-available
>
> Motivation:
> Some methods in ScalarFunction and TableFunction are unnecessary, e.g
> toString() and getResultType in ScalarFunction
> this issue intend to clear the interface.
> Goal:
> only methods related to `Collector` will remain in TableFunction interface,
> and ScalarFunction interface shall have no methods , user can choose whether
> to implement the `getResultType` method, which will be called by reflection,
> and the Flink document will have instructions for user.
> Future:
> There should be some Annotations for user to implement methods like `@Eval`
> for eval method, it be will in the next issue
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