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https://issues.apache.org/jira/browse/FLINK-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15944889#comment-15944889
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Fabian Hueske commented on FLINK-6203:
--------------------------------------
Can you provide a more detailed description of the problem? Which behavior is
unexpected? What would you expect to happen?
Thank you, Fabian
> 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
> 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:
> 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
> }
> }
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