TypeOfFunction (Flink : 2.0-SNAPSHOT API)

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 Description

TypeOfFunction(SpecializedFunction.SpecializedContext context)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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

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

- 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)
```