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https://issues.apache.org/jira/browse/FLINK-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14246887#comment-14246887
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ASF GitHub Bot commented on FLINK-1293:
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Github user fhueske commented on the pull request:
https://github.com/apache/incubator-flink/pull/243#issuecomment-67033562
Cool, thanks! :-)
Did you extend the PR in any of the above mentioned directions (Pojos,
Scala, ...)?
Let me know, when you want somebody to have a look again.
> 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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