[jira] [Created] (FLINK-7561) Add support for pre-aggregation in DataStream API

[Piotr Nowojski (JIRA)]

Piotr Nowojski created FLINK-7561:
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             Summary: Add support for pre-aggregation in DataStream API
                 Key: FLINK-7561
                 URL: https://issues.apache.org/jira/browse/FLINK-7561
             Project: Flink
          Issue Type: New Feature
          Components: DataStream API
            Reporter: Piotr Nowojski
            Assignee: Piotr Nowojski






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