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https://issues.apache.org/jira/browse/FLINK-1398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14277394#comment-14277394
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ASF GitHub Bot commented on FLINK-1398:
---------------------------------------
Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/308#issuecomment-69965449
I like the idea of having good utilities.
There is always a bit of a trade-off between having the right utilities,
and adding so many functions that the API becomes to cluttered and hard to use.
There is also the possibility to have something like a "lib" package of
common functions, that one can then simply use. Not quite as convenient as
having a function on the `DataSet`, but also prevents overloading the core set
of data set operations too much.
> A new DataSet function: extractElementFromTuple
> -----------------------------------------------
>
> Key: FLINK-1398
> URL: https://issues.apache.org/jira/browse/FLINK-1398
> Project: Flink
> Issue Type: Wish
> Reporter: Felix Neutatz
> Assignee: Felix Neutatz
> Priority: Minor
>
> This is the use case:
> {code:xml}
> DataSet<Tuple2<Integer, Double>> data = env.fromElements(new
> Tuple2<Integer, Double>(1,2.0));
>
> data.map(new ElementFromTuple());
>
> }
> public static final class ElementFromTuple implements
> MapFunction<Tuple2<Integer, Double>, Double> {
> @Override
> public Double map(Tuple2<Integer, Double> value) {
> return value.f1;
> }
> }
> {code}
> It would be awesome if we had something like this:
> {code:xml}
> data.extractElement(1);
> {code}
> This means that we implement a function for DataSet which extracts a certain
> element from a given Tuple.
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