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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1398) A new DataSet function: extractElementFromTuple
Date Tue, 21 Apr 2015 13:24:58 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504934#comment-14504934
] 

ASF GitHub Bot commented on FLINK-1398:
---------------------------------------

Github user fhueske commented on the pull request:

    https://github.com/apache/flink/pull/308#issuecomment-94792842
  
    How do we proceed with this PR?
    I think it looks good and would be OK with adding this feature to a `DataSetUtils` class.
    
    Other opinions?


> 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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