Juntao Hu created FLINK-30864:
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Summary: Optional pattern at the start of a group pattern not
working
Key: FLINK-30864
URL: https://issues.apache.org/jira/browse/FLINK-30864
Project: Flink
Issue Type: Bug
Components: Library / CEP
Affects Versions: 1.16.1
Reporter: Juntao Hu
The optional pattern at the start of a group pattern turns out be "not
optional", e.g.
{code:java}
Pattern.<String>begin("A").next(Pattern.<String>begin("B").optional().next("C")).next("D")
{code}
cannot match sequence "a1 c1 d1".
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