org.apache.flink.table.functions.hive

类 HiveScalarFunction<UDFType>

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.ScalarFunction

org.apache.flink.table.functions.hive.HiveScalarFunction<UDFType>

所有已实现的接口:

Serializable, org.apache.flink.table.functions.FunctionDefinition, HiveFunction

直接已知子类:

HiveGenericUDF, HiveSimpleUDF

@Internal
public abstract class HiveScalarFunction<UDFType>
extends org.apache.flink.table.functions.ScalarFunction
implements HiveFunction

Abstract class to provide more information for Hive UDF and GenericUDF functions.

另请参阅:

序列化表格

字段概要

字段

限定符和类型	字段和说明
protected org.apache.flink.table.types.DataType[]	argTypes
protected Object[]	constantArguments
protected UDFType	function
protected HiveFunctionWrapper<UDFType>	hiveFunctionWrapper
protected org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector	returnInspector

方法概要

限定符和类型	方法和说明
Object	eval(Object... args)
protected abstract Object	evalInternal(Object[] args) Evaluation logical, args will be wrapped when is a single array.
org.apache.flink.api.common.typeinfo.TypeInformation	getResultType(Class[] signature)
boolean	isDeterministic()
void	open(org.apache.flink.table.functions.FunctionContext context)
protected abstract void	openInternal() See UserDefinedFunction.open(FunctionContext).
void	setArgumentTypesAndConstants(Object[] constantArguments, org.apache.flink.table.types.DataType[] argTypes) Set arguments and argTypes for Function instance.

从类继承的方法 org.apache.flink.table.functions.ScalarFunction

getKind, getParameterTypes

从类继承的方法 org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, 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.hive.HiveFunction

getHiveResultType

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

getRequirements

字段详细资料

hiveFunctionWrapper

protected final HiveFunctionWrapper<UDFType> hiveFunctionWrapper

constantArguments

protected Object[] constantArguments

argTypes

protected org.apache.flink.table.types.DataType[] argTypes

function

protected transient UDFType function

returnInspector

protected transient org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector returnInspector

方法详细资料

setArgumentTypesAndConstants

public void setArgumentTypesAndConstants(Object[] constantArguments,
                                         org.apache.flink.table.types.DataType[] argTypes)

从接口复制的说明: HiveFunction

Set arguments and argTypes for Function instance. In this way, the correct method can be really deduced by the function instance.

指定者:

setArgumentTypesAndConstants 在接口中 HiveFunction

参数:

constantArguments - arguments of a function call (only literal arguments are passed, nulls for non-literal ones)

argTypes - types of arguments

isDeterministic

public boolean isDeterministic()

指定者:

isDeterministic 在接口中 org.apache.flink.table.functions.FunctionDefinition

getResultType

public org.apache.flink.api.common.typeinfo.TypeInformation getResultType(Class[] signature)

覆盖:

getResultType 在类中 org.apache.flink.table.functions.ScalarFunction

open

public void open(org.apache.flink.table.functions.FunctionContext context)

覆盖:

open 在类中 org.apache.flink.table.functions.UserDefinedFunction

openInternal

protected abstract void openInternal()

See UserDefinedFunction.open(FunctionContext).

eval

public Object eval(Object... args)

evalInternal

protected abstract Object evalInternal(Object[] args)

Evaluation logical, args will be wrapped when is a single array.