[jira] [Updated] (FLINK-12711) Separate function implementation and definition

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-12711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-12711:
-----------------------------------
    Labels: pull-request-available  (was: )

> Separate function implementation and definition
> -----------------------------------------------
>
>                 Key: FLINK-12711
>                 URL: https://issues.apache.org/jira/browse/FLINK-12711
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / API
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>            Priority: Major
>              Labels: pull-request-available
>
> This issue continues the work that was started in FLINK-11449. It distinguishes between function with implementation (UDFs) and function with no implementation.
> The rough design looks as follows:
> {noformat}
> 1. `interface FunctionDefinition`
>    --> general interface for describing a function
>    --> goal: separation of runtime and planning/optimization
>    --> long-term methods: `getKind()` (aggregate, scalar, table), `getTypeInference()`
> 2. `interface UserDefinedFunctionDefinition extends FunctionDefinition`
>    --> interface for describing a function with implementation
>    --> methods: `createImplementation(): UserDefinedFunction`
>    --> default: getTypeInference() = Util.DEFAULT_INFERENCE // future work
> 3. `class BuiltInFunctionDefinition implements FunctionDefinition`
>    --> class for describing a function where the planner provides an implementation
>    --> methods: `getName(): String`
> 4. Add `getKind` to `AggregateFunction`, `ScalarFunction`, `TableFunction`
> {noformat}



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