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https://issues.apache.org/jira/browse/FLINK-7147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143367#comment-16143367
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ASF GitHub Bot commented on FLINK-7147:
---------------------------------------
Github user dianfu commented on a diff in the pull request:
https://github.com/apache/flink/pull/4296#discussion_r135441351
--- 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 --
originalStateMap is used when compiling the NFA and it will be collected
after NFA is created and so I think it's unnecessary to clear the entries.
> Support greedy quantifier in CEP
> --------------------------------
>
> Key: FLINK-7147
> URL: https://issues.apache.org/jira/browse/FLINK-7147
> Project: Flink
> Issue Type: Sub-task
> Components: CEP, Table API & SQL
> Reporter: Dian Fu
> Assignee: Dian Fu
>
> Greedy quantifier will try to match the token as many times as possible. For
> example, for pattern {{a b* c}} (skip till next is used) and inputs {{a b1 b2
> c}}, if the quantifier for {{b}} is greedy, it will only output {{a b1 b2 c}}.
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