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

    https://github.com/apache/flink/pull/3585#discussion_r107707653
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/scala/stream/sql/SqlITCase.scala
 ---
    @@ -317,4 +397,24 @@ class SqlITCase extends StreamingWithStateTestBase {
         result.addSink(new StreamITCase.StringSink)
         env.execute()
       }
    +
    +}
    +
    +object SqlITCase {
    +
    +  class TimestampWithLatenessWatermark(allowedLateness: Long)
    --- End diff --
    
    I don't think we need this timestamp extractor. IMO, the offset should be 
integrated into the window operator itself and not rely on modified watermarks. 
    I'd suggest to first add this OVER window operator without offset support 
and add this later when the other OVER window operators have been added. 
    
    What do you think, @shaoxuan-wang and @sunjincheng121 ?


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