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https://issues.apache.org/jira/browse/FLINK-7147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116435#comment-16116435
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ASF GitHub Bot commented on FLINK-7147:
---------------------------------------
Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4296#discussion_r131628087
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/compiler/NFACompiler.java
---
@@ -637,9 +675,23 @@ private boolean isPatternOptional(Pattern<T, ?>
pattern) {
untilCondition,
true);
- final IterativeCondition<T> proceedCondition =
getTrueFunction();
+ IterativeCondition<T> proceedCondition =
getTrueFunction();
final State<T> loopingState =
createState(currentPattern.getName(), State.StateType.Normal);
- loopingState.addProceed(sinkState, proceedCondition);
+
+ if
(currentPattern.getQuantifier().hasProperty(Quantifier.QuantifierProperty.GREEDY))
{
+ State<T> sinkStateCopy = copy(sinkState);
--- End diff --
If I understood correctly the copies are needed only in casese where there
is the `untilCondition`. Am I right? If so let's create the copy then. Right
know there are dangling copies of the next when there is no `untilCondtion`.
> 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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