Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/3477
Hi @dawidwys , the following produces no output, which should not be the
case. The same holds if you change the pattern to `oneOrMore`.
```
public void testZeroOrMore() {
List<StreamRecord<Event>> inputEvents = new ArrayList<>();
Event startEvent = new Event(40, "c", 1.0);
Event middleEvent1 = new Event(41, "a", 2.0);
Event middleEvent2 = new Event(42, "a", 3.0);
Event middleEvent3 = new Event(43, "a", 4.0);
Event end1 = new Event(44, "b", 5.0);
Event end2 = new Event(45, "d", 6.0);
Event end3 = new Event(46, "d", 7.0);
Event end4 = new Event(47, "e", 8.0);
inputEvents.add(new StreamRecord<>(startEvent, 1));
inputEvents.add(new StreamRecord<>(middleEvent1, 3));
inputEvents.add(new StreamRecord<>(middleEvent2, 4));
inputEvents.add(new StreamRecord<>(middleEvent3, 5));
inputEvents.add(new StreamRecord<>(end1, 6));
inputEvents.add(new StreamRecord<>(end2, 7));
inputEvents.add(new StreamRecord<>(end3, 8));
inputEvents.add(new StreamRecord<>(end4, 9));
Pattern<Event, ?> pattern =
Pattern.<Event>begin("start").where(new FilterFunction<Event>() {
private static final long serialVersionUID =
5726188262756267490L;
@Override
public boolean filter(Event value) throws Exception {
return value.getName().equals("a");
}
}).zeroOrMore();
NFA<Event> nfa = NFACompiler.compile(pattern,
Event.createTypeSerializer(), false);
Set<Set<Event>> resultingPatterns = new HashSet<>();
List<Collection<Event>> allPatterns = new ArrayList<>();
for (StreamRecord<Event> inputEvent : inputEvents) {
Collection<Map<String, Event>> patterns = nfa.process(
inputEvent.getValue(),
inputEvent.getTimestamp()).f0;
for (Map<String, Event> foundPattern : patterns) {
System.out.println(foundPattern);
}
}
}
```
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