Juntao Hu created FLINK-30839:
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Summary: Relaxed looping group pattern make the following strict
contiguity relaxed too
Key: FLINK-30839
URL: https://issues.apache.org/jira/browse/FLINK-30839
Project: Flink
Issue Type: Bug
Components: Library / CEP
Affects Versions: 1.16.1
Reporter: Juntao Hu
Attachments: looping-group-pattern-relaxed-1.png
If a group pattern loops with relaxed contiguity, the strict contiguity between
group pattern and next pattern turns out to be as the same effect as relaxed
contiguity.
E.g. for pattern:
{code:java}
Pattern.begin(Pattern.begin("A").next("B")).oneOrMore().next("C")
{code}
sequence (a b d c) is also a matched one, which is abviously wrong.
As part of the NFA below shows, the ignore edge on A state causes the
unexpected ignoration of event "d".
!looping-group-pattern-relaxed.png!
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