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