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

    https://github.com/apache/flink/pull/4296#discussion_r135366122
  
    --- Diff: 
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/compiler/NFACompiler.java
 ---
    @@ -421,6 +437,15 @@ private void addStopStateToLooping(final State<T> 
loopingState) {
                                untilCondition,
                                true);
     
    +                   if 
(currentPattern.getQuantifier().hasProperty(Quantifier.QuantifierProperty.GREEDY)
 &&
    +                           times.getFrom() != times.getTo()) {
    +                           if (untilCondition != null) {
    +                                   State<T> sinkStateCopy = 
copy(sinkState);
    +                                   
originalStateMap.put(sinkState.getName(), sinkStateCopy);
    --- End diff --
    
    When are the old entries cleared in this map ?
    Shall we consider using map which expires entries by TTL ?


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