[jira] [Assigned] (FLINK-834) Extend writeAsText with custom formatting function.

["Chesnay Schepler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chesnay Schepler reassigned FLINK-834:
--------------------------------------

    Assignee: Chesnay Schepler

> Extend writeAsText with custom formatting function.
> ---------------------------------------------------
>
>                 Key: FLINK-834
>                 URL: https://issues.apache.org/jira/browse/FLINK-834
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: GitHub Import
>            Assignee: Chesnay Schepler
>              Labels: github-import, starter
>             Fix For: pre-apache
>
>
> Currently, write as text uses the `toString()` method of data types to serialize the output as text. Alternatively, we have a CSV format that writes Tuple Datasets by using the `toString()` methods of the individual fields. Since Tuple's `toString()` method cannot be adapted without extending the class, it is not easily possible to define a custom output format of data sets which include Tuples.
> I think it would be good to have a way to explicitly format a text output. 
> We could add a formatting function that returns a String for an input element, such as
> ```
> DataSet<Tuple2<String, MyPojo>> myDS;
> myDS.writeAsFormattedText("hdfs:///myOutPath", 
>   new TextFormatter<Tuple2<String, MyPojo>>() {
>     @Override
>     public String format(Tuple2<String, MyPojo> input) {
>       return input.f0+" -> "+
>              input.f1.getWhatEver()+"  and "+
>              input.f1.getSomethingElse();
>     });
> ```
> Internally, we would use the default TextOutputFormat but with a previous Map for formatting.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/834
> Created by: [fhueske|https://github.com/fhueske]
> Labels: enhancement, java api, simple-issue, user satisfaction, 
> Milestone: Release 0.6 (unplanned)
> Created at: Mon May 19 14:39:51 CEST 2014
> State: open



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