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Posted to issues@flink.apache.org by "zhangxiaoyu (JIRA)" <ji...@apache.org> on 2017/07/28 12:33:02 UTC

[jira] [Created] (FLINK-7292) Fix EMPTY MATCH bug in CEP.

zhangxiaoyu created FLINK-7292:
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             Summary: Fix EMPTY MATCH bug in CEP.
                 Key: FLINK-7292
                 URL: https://issues.apache.org/jira/browse/FLINK-7292
             Project: Flink
          Issue Type: Bug
          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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