SupportsPreWriteTopology (Flink : 2.0-SNAPSHOT API)

```
@Experimental
public interface SupportsPreWriteTopology<InputT>
```
Allows expert users to implement a custom topology before SinkWriter.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`DataStream<InputT>`	`addPreWriteTopology(DataStream<InputT> inputDataStream)`	Adds an arbitrary topology before the writer.

- Method Detail
  - addPreWriteTopology
```
DataStream<InputT> addPreWriteTopology(DataStream<InputT> inputDataStream)
```
    Adds an arbitrary topology before the writer. The topology may be used to repartition the data.
    
    Parameters:
    
    inputDataStream - the stream of input records.
    
    Returns:
    
    the custom topology before SinkWriter.