[jira] [Created] (FLINK-3174) Add merging WindowAssigner

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3174:
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             Summary: Add merging WindowAssigner
                 Key: FLINK-3174
                 URL: https://issues.apache.org/jira/browse/FLINK-3174
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek
             Fix For: 1.0.0


We should add the possibility for WindowAssigners to merge windows. This will enable Session windowing support, similar to how Google Cloud Dataflow supports.

For session windows, each element would initially be assigned to its own window. When triggering we check the windows and see if any can be merged. This way, elements with overlapping session windows merge into one session.



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