[jira] [Assigned] (FLINK-6203) DataSet Transformations

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

     [ https://issues.apache.org/jira/browse/FLINK-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chesnay Schepler reassigned FLINK-6203:
---------------------------------------

    Assignee: Chesnay Schepler

> DataSet Transformations
> -----------------------
>
>                 Key: FLINK-6203
>                 URL: https://issues.apache.org/jira/browse/FLINK-6203
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API
>    Affects Versions: 1.2.0
>            Reporter: 苏拓
>            Assignee: Chesnay Schepler
>            Priority: Minor
>             Fix For: 1.2.0
>
>
> the example of GroupReduce on sorted groups can't remove duplicate Strings in a DataSet.
> need to add  "prev=t"
> such as:
> {code}
> val output = input.groupBy(0).sortGroup(1, Order.ASCENDING).reduceGroup {
>       (in, out: Collector[(Int, String)]) =>
>         var prev: (Int, String) = null
>         for (t <- in) {
>           if (prev == null || prev != t)
>             out.collect(t)
>             prev=t // this line is missing in the example
>         }
>     }
> {code}



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