Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4296#discussion_r130537682
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/compiler/NFACompiler.java
---
@@ -657,25 +663,34 @@ private boolean isPatternOptional(Pattern<T, ?>
pattern) {
true);
IterativeCondition<T> proceedCondition =
getTrueFunction();
- if (currentPattern.getQuantifier().isGreedy()) {
- proceedCondition =
getGreedyCondition(proceedCondition, Lists.newArrayList(takeCondition));
+ if
(currentPattern.getQuantifier().hasProperty(Quantifier.QuantifierProperty.GREEDY))
{
+ proceedCondition = getGreedyCondition(
+ proceedCondition,
+ takeCondition,
+ ignoreCondition,
+ followingTakeCondition);;
}
final State<T> loopingState =
createState(currentPattern.getName(), State.StateType.Normal,
- currentPattern.getQuantifier().isGreedy());
+
currentPattern.getQuantifier().hasProperty(Quantifier.QuantifierProperty.GREEDY));
loopingState.addProceed(sinkState, proceedCondition);
loopingState.addTake(takeCondition);
addStopStateToLooping(loopingState);
if (ignoreCondition != null) {
final State<T> ignoreState =
createState(currentPattern.getName(), State.StateType.Normal,
-
currentPattern.getQuantifier().isGreedy());
+
currentPattern.getQuantifier().hasProperty(Quantifier.QuantifierProperty.GREEDY));
ignoreState.addTake(loopingState,
takeCondition);
ignoreState.addIgnore(ignoreCondition);
loopingState.addIgnore(ignoreState,
ignoreCondition);
+ if
(currentPattern.getQuantifier().hasProperty(Quantifier.QuantifierProperty.GREEDY))
{
--- End diff --
I think the problem you mentioned with
`GreedyITCase.testGreedyZeroOrMoreBeforeOptional2` is due to that proceed. The
whole reason behind the additional ignoreState was for it not to have the
`PROCEED` transition as it creates additional computationStates with the
`sinkState`. I think for the greedy to work we need to put customized
ignoreCondition into the `sinkState` of a greedy Pattern. What do you think?
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