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Posted to issues@flink.apache.org by "Timo Walther (JIRA)" <ji...@apache.org> on 2014/06/25 15:22:24 UTC
[jira] [Updated] (FLINK-970) Implement a first(n) operator
[ https://issues.apache.org/jira/browse/FLINK-970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Timo Walther updated FLINK-970:
-------------------------------
Assignee: (was: Timo Walther)
> Implement a first(n) operator
> -----------------------------
>
> Key: FLINK-970
> URL: https://issues.apache.org/jira/browse/FLINK-970
> Project: Flink
> Issue Type: New Feature
> Reporter: Timo Walther
> Priority: Minor
>
> It is only syntactic sugar, but I had many cases where I just needed the first element or the first 2 elements in a GroupReduce.
> E.g. Instead of
> {code:java}
> .reduceGroup(new GroupReduceFunction<String, String>() {
> @Override
> public void reduce(Iterator<String> values, Collector<String> out) throws Exception {
> out.collect(values.next());
> }
> })
> {code}
> {code:java}
> .first()
> {code}
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