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https://issues.apache.org/jira/browse/FLINK-11510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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wangpeibin reassigned FLINK-11510:
----------------------------------
Assignee: wangpeibin
> Add the MultiFieldSumAggregator to support KeyedStream.sum(int[]
> positionToSums )
> ---------------------------------------------------------------------------------
>
> Key: FLINK-11510
> URL: https://issues.apache.org/jira/browse/FLINK-11510
> Project: Flink
> Issue Type: Improvement
> Reporter: wangpeibin
> Assignee: wangpeibin
> Priority: Minor
>
> The goal is to implement a KeyedStream API to sum with *multi field*.
> The example code with like:
> {code:java}
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> DataStream<Tuple3<Long, Long, Integer>> src =
> env.fromCollection(Arrays.asList(
> new Tuple3<>(1L, 2L, 2),
> new Tuple3<>(1L, 3L, 3),
> new Tuple3<>(1L, 4L, 4),
> new Tuple3<>(2L, 2L, 2),
> new Tuple3<>(2L, 3L, 3),
> new Tuple3<>(2L, 4L, 4)
> ));
> src.keyBy(0)
> .sum(new int[] {1, 2}) // right now only sum(1) or sum("f0") is supported
> .print();
> env.execute();
>
> {code}
> and the output is expected to be：
> {code:java}
> 1> (1,2,2)
> 1> (2,2,2)
> 1> (1,5,5)
> 1> (2,5,5)
> 1> (1,9,9)
> 1> (2,9,9)
> {code}
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