[jira] [Created] (FLINK-5963) Remove preparation mapper of DataSetAggregate

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-5963:
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             Summary: Remove preparation mapper of DataSetAggregate
                 Key: FLINK-5963
                 URL: https://issues.apache.org/jira/browse/FLINK-5963
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
    Affects Versions: 1.3.0
            Reporter: Fabian Hueske
            Priority: Minor


With the new UDAGG interface we do not need the preparation mapper anymore. It adds overhead because

- it is another operator
- it prevents to use {{AggregateFunction.accumulate()}} in a combiner or reducer.

Hence, it should be removed.



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