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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