Github user sunjincheng121 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3150#discussion_r96635999
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/runtime/dataset/DataSetWindowAggregateITCase.scala
 ---
    @@ -119,4 +119,35 @@ class DataSetWindowAggregateITCase(
         val results = windowedTable.toDataSet[Row].collect()
         TestBaseUtils.compareResultAsText(results.asJava, expected)
       }
    +
    +  @Test
    +  def testEventTimeSessionGroupWindow(): Unit = {
    +    val env = ExecutionEnvironment.getExecutionEnvironment
    +    val tEnv = TableEnvironment.getTableEnvironment(env, config)
    +
    +    val table = env.fromCollection(data).toTable(tEnv, 'long, 'int, 
'string)
    +    val windowedTable = table
    +      .groupBy('string)
    +      .window(Session withGap 7.milli on 'long as 'w)
    +      .select('string, 'string.count, 'w.start, 'w.end)
    +
    +    val results = windowedTable.toDataSet[Row].collect()
    +
    +    val expected = "Hallo,1,1970-01-01 00:00:00.002,1970-01-01 
00:00:00.009\nHello world,1," +
    +      "1970-01-01 00:00:00.008,1970-01-01 00:00:00.015\nHello world,1," +
    +      "1970-01-01 00:00:00.016,1970-01-01 00:00:00.023\nHello,3,1970-01-01 
00:00:00.003," +
    +      "1970-01-01 00:00:00.013\nHi,1,1970-01-01 00:00:00.001,1970-01-01 
00:00:00.008"
    +    TestBaseUtils.compareResultAsText(results.asJava, expected)
    +  }
    +
    +  @Test(expected = classOf[UnsupportedOperationException])
    +  def testAlldEventTimeSessionGroupWindow(): Unit = {
    --- End diff --
    
    Yes, I have discussed this with fabian, and we will add non-grouped session 
windows for batch tables in  
[FLINK-5219](https://issues.apache.org/jira/browse/FLINK-5219).


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