MapFunction (Flink : Core 1.18.1-cp1 API)

Type Parameters:

T - Type of the input elements.

O - Type of the returned elements.

All Superinterfaces:

Function, Serializable

All Known Implementing Classes:

RichMapFunction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@Public
@FunctionalInterface
public interface MapFunction<T,O>
extends Function, Serializable
```
Base interface for Map functions. Map functions take elements and transform them, element wise. A Map function always produces a single result element for each input element. Typical applications are parsing elements, converting data types, or projecting out fields. Operations that produce multiple result elements from a single input element can be implemented using the FlatMapFunction.
The basic syntax for using a MapFunction is as follows:
```
 DataSet<X> input = ...;

 DataSet<Y> result = input.map(new MyMapFunction());
 
```

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  O map(T value)
  The mapping method.

- Method Detail
  - map
```
O map(T value)
throws Exception
```
    The mapping method. Takes an element from the input data set and transforms it into exactly one element.
    
    Parameters:
    
    value - The input value.
    
    Returns:
    
    The transformed value
    
    Throws:
    
    Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.