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https://issues.apache.org/jira/browse/FLINK-7292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106904#comment-16106904
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zhangxiaoyu commented on FLINK-7292:
------------------------------------
A use case is discussed in
https://github.com/apache/flink/pull/4331#discussion_r130264936.
> Fix EMPTY MATCH bug in CEP.
> ---------------------------
>
> Key: FLINK-7292
> URL: https://issues.apache.org/jira/browse/FLINK-7292
> Project: Flink
> Issue Type: Sub-task
> Components: CEP
> Reporter: zhangxiaoyu
>
> Currently, with the pattern {quote}a? {quote}and the event{quote} a1{quote},
> the result pattern is only{quote} a1{quote}without the empty match.
> We wish the empty matched is also returned. And I am working on this issue
> now.
> My method is checking if there exists empty match only when the the first
> event comes(at the StartState) ——try to traverse the PROCEED edges with the
> trueFunction condition from the StartState, see if it can arrive FinalState,
> if so, add an empty list to the result.
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