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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/01/16 13:12:26 UTC
[jira] [Commented] (FLINK-1293) Add support for out-of-place
aggregations
[ https://issues.apache.org/jira/browse/FLINK-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823947#comment-15823947 ]
ASF GitHub Bot commented on FLINK-1293:
---------------------------------------
Github user tonycox commented on the issue:
https://github.com/apache/flink/pull/243
Is this PR still alive?
> 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: DataSet API
> Affects Versions: 0.7.0-incubating
> Reporter: Viktor Rosenfeld
> Assignee: Fabian Hueske
> 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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