org.apache.flink.table.functions

类 BuiltInFunctionDefinition

java.lang.Object

org.apache.flink.table.functions.BuiltInFunctionDefinition

所有已实现的接口:

FunctionDefinition

@Internal
public final class BuiltInFunctionDefinition
extends Object
implements FunctionDefinition

Definition of a built-in function. It enables unique identification across different modules by reference equality.

Compared to regular FunctionDefinition, built-in functions have a default name. This default name is used to lookup the function in a catalog during resolution.

Equality is defined by reference equality.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	BuiltInFunctionDefinition.Builder Builder for fluent definition of built-in functions.

方法概要

限定符和类型	方法和说明
FunctionKind	getKind() Returns the kind of function this definition describes.
String	getName()
TypeInference	getTypeInference(DataTypeFactory typeFactory) Returns the logic for performing type inference of a call to this function definition.
static BuiltInFunctionDefinition.Builder	newBuilder() Builder for configuring and creating instances of BuiltInFunctionDefinition.
String	toString()

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

从接口继承的方法 org.apache.flink.table.functions.FunctionDefinition

getRequirements, isDeterministic

方法详细资料

newBuilder

public static BuiltInFunctionDefinition.Builder newBuilder()

Builder for configuring and creating instances of BuiltInFunctionDefinition.

getName

public String getName()

getKind

public FunctionKind getKind()

从接口复制的说明: FunctionDefinition

Returns the kind of function this definition describes.

指定者:

getKind 在接口中 FunctionDefinition

getTypeInference

public TypeInference getTypeInference(DataTypeFactory typeFactory)

从接口复制的说明: FunctionDefinition

Returns the logic for performing type inference of a call to this function definition.

The type inference process is responsible for inferring unknown types of input arguments, validating input arguments, and producing result types. The type inference process happens independent of a function body. The output of the type inference is used to search for a corresponding runtime implementation.

Instances of type inference can be created by using TypeInference.newBuilder().

See BuiltInFunctionDefinitions for concrete usage examples.

指定者:

getTypeInference 在接口中 FunctionDefinition

toString

public String toString()

覆盖:

toString 在类中 Object