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https://issues.apache.org/jira/browse/FLINK-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947750#comment-15947750
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Stephan Ewen commented on FLINK-6203:
-------------------------------------
I think there is simply one line missing in the example - the example is thus
incorrect.
Could you open a pull request for this issue?
> 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:
> {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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