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

    https://github.com/apache/flink/pull/3863#discussion_r115779043
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/runtime/harness/OverWindowHarnessTest.scala
 ---
    @@ -220,15 +74,19 @@ class OverWindowHarnessTest extends HarnessTestBase{
         testHarness.processElement(new StreamRecord(
           CRow(Row.of(2: JInt, 0L: JLong, 0: JInt, "bbb", 30L: JLong), true), 
1))
     
    -    testHarness.setProcessingTime(2)
    +    // trigger cleanup timer and register cleanup timer with 6001
    +    testHarness.setProcessingTime(3001)
         testHarness.processElement(new StreamRecord(
           CRow(Row.of(1: JInt, 11L: JLong, 1: JInt, "aaa", 7L: JLong), true), 
2))
         testHarness.processElement(new StreamRecord(
           CRow(Row.of(1: JInt, 11L: JLong, 1: JInt, "aaa", 8L: JLong), true), 
2))
         testHarness.processElement(new StreamRecord(
           CRow(Row.of(1: JInt, 11L: JLong, 1: JInt, "aaa", 9L: JLong), true), 
2))
    +
    +    // using historical data and register cleanup timer with 9000
    --- End diff --
    
    what do you mean by historical data?


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