Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3150#discussion_r96810332
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/dataset/DataSetWindowAggregate.scala
 ---
    @@ -128,10 +128,8 @@ class DataSetWindowAggregate(
               inputDS,
               isTimeInterval(size.resultType),
               caseSensitive)
    -
    -      case EventTimeSessionGroupWindow(_, _, _) =>
    -        throw new UnsupportedOperationException(
    -          "Event-time session windows in a batch environment are currently 
not supported")
    +      case EventTimeSessionGroupWindow(_, _, gap) =>
    +        createEventTimeSessionWindowDataSet(inputDS,caseSensitive)
    --- End diff --
    
    add space: `(inputDS, caseSensitive)`


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