KeyByKeySelector (Flink : Python 2.1.1-cp1 API)

java.lang.Object
- org.apache.flink.streaming.api.functions.python.KeyByKeySelector

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.java.functions.KeySelector<org.apache.flink.types.Row,org.apache.flink.types.Row>
```
@Internal
public class KeyByKeySelector
extends Object
implements org.apache.flink.api.java.functions.KeySelector<org.apache.flink.types.Row,org.apache.flink.types.Row>
```
KeyByKeySelector is responsible for extracting the first field of the input row as key. The input row is generated by python DataStream map function in the format of (key_selector.get_key(value), value) tuple2.

See Also:

Serialized Form

- Constructor Summary
  
  Constructors
  Constructor Description
  
  KeyByKeySelector()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  org.apache.flink.types.Row getKey(org.apache.flink.types.Row value)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - KeyByKeySelector
```
public KeyByKeySelector()
```
- Method Detail
  - getKey
```
public org.apache.flink.types.Row getKey(org.apache.flink.types.Row value)
```
    Specified by:
    
    getKey in interface org.apache.flink.api.java.functions.KeySelector<org.apache.flink.types.Row,org.apache.flink.types.Row>