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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