org.apache.flink.table.functions.hive

Class 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>

All Implemented Interfaces:

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

Direct Known Subclasses:

HiveGenericUDF, HiveSimpleUDF

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

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

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
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

Method Summary

Modifier and Type	Method and Description
Object	eval(Object... args)
protected abstract Object	evalInternal(Object[] args) Evaluation logical, args will be wrapped when is a single array.
org.apache.flink.table.types.inference.TypeInference	getTypeInference(org.apache.flink.table.catalog.DataTypeFactory typeFactory)
protected abstract org.apache.flink.table.types.DataType	inferReturnType() Infer return type of this function call.
boolean	isDeterministic()
void	open(org.apache.flink.table.functions.FunctionContext context)
protected abstract void	openInternal() See UserDefinedFunction.open(FunctionContext).

Methods inherited from class org.apache.flink.table.functions.ScalarFunction

getKind, getParameterTypes, getResultType

Methods inherited from class org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.functions.FunctionDefinition

getRequirements

Field Detail

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

Method Detail

isDeterministic

public boolean isDeterministic()

open

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

Overrides:

open in class org.apache.flink.table.functions.UserDefinedFunction

getTypeInference

public org.apache.flink.table.types.inference.TypeInference getTypeInference(org.apache.flink.table.catalog.DataTypeFactory typeFactory)

Specified by:

getTypeInference in interface org.apache.flink.table.functions.FunctionDefinition

Overrides:

getTypeInference in class org.apache.flink.table.functions.ScalarFunction

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.

inferReturnType

protected abstract org.apache.flink.table.types.DataType inferReturnType()
                                                                  throws org.apache.hadoop.hive.ql.exec.UDFArgumentException

Infer return type of this function call.

Throws:

org.apache.hadoop.hive.ql.exec.UDFArgumentException