[jira] [Created] (FLINK-15688) Add N-Ary Stream Operator in Flink

["Piotr Nowojski (Jira)" <ji...@apache.org>]

Piotr Nowojski created FLINK-15688:
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             Summary: Add N-Ary Stream Operator in Flink
                 Key: FLINK-15688
                 URL: https://issues.apache.org/jira/browse/FLINK-15688
             Project: Flink
          Issue Type: New Feature
          Components: API / DataStream, Runtime / Task
    Affects Versions: 1.11.0
            Reporter: Piotr Nowojski
            Assignee: Piotr Nowojski


As described here: https://cwiki.apache.org/confluence/display/FLINK/FLIP-92%3A+Add+N-Ary+Stream+Operator+in+Flink

The plan is to provide an N-Ary Stream Operator with more or less the following interface:
{code}
abstract class StreamOperatorNG<OUT> {
  Collection<Input<?>> getInputs()
 
  // as well as all the other methods of existing StreamOperator
  // and AbstractStreamOperator:
  // setup()/open()/close()/snapshot()/restore() ...
}
 
abstract class Input<T> {
  // for determining whether two inputs are equal
  private final UUID uuid = UUID.randomUUID();
 
  public abstract void processElement(StreamRecord<T> element)
 
  public abstract void processWatermark(Watermark watermark)
}
{code}



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