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

    https://github.com/apache/flink/pull/4320#discussion_r132443663
  
    --- Diff: 
flink-libraries/flink-cep-scala/src/main/scala/org/apache/flink/cep/scala/PatternStream.scala
 ---
    @@ -82,36 +78,54 @@ class PatternStream[T](jPatternStream: 
JPatternStream[T]) {
         *                               pattern sequence.
         * @tparam L Type of the resulting timeout event
         * @tparam R Type of the resulting event
    +    * @deprecated Use the version that returns timeouted events as a 
side-output
         * @return Data stream of either type which contains the resulting 
events and resulting timeout
         *         events.
         */
    +  @deprecated
       def select[L: TypeInformation, R: TypeInformation](
         patternTimeoutFunction: PatternTimeoutFunction[T, L],
         patternSelectFunction: PatternSelectFunction[T, R])
       : DataStream[Either[L, R]] = {
    +    val outputTag = OutputTag[L]("dummy-timeouted")
    --- End diff --
    
    Maybe don't use "dummy" for that.


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