[jira] [Created] (FLINK-1619) Add pre-aggregator for time windows

[Gyula Fora (JIRA)]

Gyula Fora created FLINK-1619:
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             Summary: Add pre-aggregator for time windows
                 Key: FLINK-1619
                 URL: https://issues.apache.org/jira/browse/FLINK-1619
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Gyula Fora


Currently there is only support for pre-aggregators for tumbling policies.

A pre-aggregator should be added for time policies.



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