org.apache.flink.table.functions

类 ScalarFunctionDefinition

java.lang.Object

org.apache.flink.table.functions.ScalarFunctionDefinition

所有已实现的接口:

FunctionDefinition

@Internal
public final class ScalarFunctionDefinition
extends Object
implements FunctionDefinition

A "marker" function definition of a user-defined scalar function that uses the old type system stack.

This class can be dropped once we introduce a new type inference.

构造器概要

构造器

构造器和说明
ScalarFunctionDefinition(String name, ScalarFunction scalarFunction)

方法概要

限定符和类型	方法和说明
boolean	equals(Object o)
FunctionKind	getKind() Returns the kind of function this definition describes.
String	getName()
Set<FunctionRequirement>	getRequirements() Returns the set of requirements this definition demands.
ScalarFunction	getScalarFunction()
TypeInference	getTypeInference(DataTypeFactory factory) Returns the logic for performing type inference of a call to this function definition.
int	hashCode()
boolean	isDeterministic() Returns information about the determinism of the function's results.
String	toString()

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

ScalarFunctionDefinition

public ScalarFunctionDefinition(String name,
                                ScalarFunction scalarFunction)

方法详细资料

getName

public String getName()

getScalarFunction

public ScalarFunction getScalarFunction()

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 factory)

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

getRequirements

public Set<FunctionRequirement> getRequirements()

从接口复制的说明: FunctionDefinition

Returns the set of requirements this definition demands.

指定者:

getRequirements 在接口中 FunctionDefinition

isDeterministic

public boolean isDeterministic()

从接口复制的说明: FunctionDefinition

Returns information about the determinism of the function's results.

It returns true if and only if a call to this function is guaranteed to always return the same result given the same parameters. true is assumed by default. If the function is not pure functional like random(), date(), now(), ... this method must return false.

指定者:

isDeterministic 在接口中 FunctionDefinition

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

toString

public String toString()

覆盖:

toString 在类中 Object