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https://issues.apache.org/jira/browse/FLINK-970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047120#comment-14047120
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Chesnay Schepler commented on FLINK-970:
----------------------------------------
would it be enough the add the following code to the
DataSet/UnsortedGrouping/SortedGrouping classes?
{code:java}
public ReduceGroupOperator<T, T> first(final int n) {
return new ReduceGroupOperator<T, T>(this, new
GroupReduceFunction<T, T>() {
@Override
public void reduce(Iterator<T> values, Collector<T>
out) throws Exception {
for (int x=0; x < n && values.hasNext(); x++) {
out.collect(values.next());
}}});
}
{code}
> 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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