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From 苏拓 (JIRA) <j...@apache.org>
Subject [jira] [Created] (FLINK-6203) DataSet Transformations
Date Tue, 28 Mar 2017 09:30:42 GMT
苏拓 created FLINK-6203:
-------------------------

             Summary: 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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