[jira] [Created] (FLINK-1398) A new DataSet function: extractElementFromTuple

[Shang Yuanchun (Jira)]

Felix Neutatz created FLINK-1398:
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             Summary: 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
            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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