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Posted to issues@flink.apache.org by "Viktor Rosenfeld (JIRA)" <ji...@apache.org> on 2014/11/28 15:10:12 UTC

[jira] [Created] (FLINK-1293) Add support for out-of-place aggregations

Viktor Rosenfeld created FLINK-1293:
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             Summary: Add support for out-of-place aggregations
                 Key: FLINK-1293
                 URL: https://issues.apache.org/jira/browse/FLINK-1293
             Project: Flink
          Issue Type: Improvement
          Components: Java API, Scala API
    Affects Versions: 0.7.0-incubating
            Reporter: Viktor Rosenfeld
            Assignee: Viktor Rosenfeld
            Priority: Minor


Currently, the output of an aggregation is of the same type as the input. This restriction has to major drawbacks:

1. Every tuple field can only be used in one aggregation because the aggregations result is stored in the field.

2. Aggregations having a return type that is different from the input type, e.g., count or average, cannot be implemented.

It would be nice to have the aggregation return any kind of tuple as a result, so the restrictions above no longer apply.

See also:
- https://github.com/stratosphere/stratosphere/wiki/Design-of-Aggregate-Operator
- http://apache-flink-incubator-mailing-list-archive.1008284.n3.nabble.com/Hi-Aggregation-support-td2311.html



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