org.apache.flink.table.runtime.functions.scalar

Class TypeOfFunction

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.ScalarFunction

org.apache.flink.table.runtime.functions.scalar.BuiltInScalarFunction

org.apache.flink.table.runtime.functions.scalar.TypeOfFunction

All Implemented Interfaces:

Serializable, FunctionDefinition

@Internal
public class TypeOfFunction
extends BuiltInScalarFunction

Implementation of BuiltInFunctionDefinitions.TYPE_OF.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TypeOfFunction(SpecializedFunction.SpecializedContext context)

Method Summary

Modifier and Type	Method and Description
StringData	eval(Object... unused)
void	open(FunctionContext context) Setup method for user-defined function.

Methods inherited from class org.apache.flink.table.runtime.functions.scalar.BuiltInScalarFunction

getArgumentDataTypes, getOutputDataType, getRequirements, getTypeInference, isDeterministic

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

Constructor Detail

TypeOfFunction

public TypeOfFunction(SpecializedFunction.SpecializedContext context)

Method Detail

open

public void open(FunctionContext context)
          throws Exception

Description copied from class: UserDefinedFunction

Setup method for user-defined function. It can be used for initialization work. By default, this method does nothing.

Overrides:

open in class UserDefinedFunction

Throws:

Exception

eval

@Nullable
public StringData eval(Object... unused)