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https://issues.apache.org/jira/browse/FLINK-10590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16721978#comment-16721978
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bupt_ljy commented on FLINK-10590:
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It seems that we need to support the group patterns, then we're able to have
the problem....
> Optional quantifier is discarded from first element of group pattern
> --------------------------------------------------------------------
>
> Key: FLINK-10590
> URL: https://issues.apache.org/jira/browse/FLINK-10590
> Project: Flink
> Issue Type: Bug
> Components: CEP, Table API & SQL
> Reporter: Dawid Wysakowicz
> Priority: Major
>
> In a pattern {{(A? B)+}}, the optional property of {{A}} state is effectively
> discarded in the compiled state machine.
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