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https://issues.apache.org/jira/browse/FLINK-4641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121550#comment-16121550
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zhangxiaoyu commented on FLINK-4641:
------------------------------------

I have two cases to discuss with you.
    (a*|b*)c with strategy SKIP_TILL_NEXT, when event c comes, both branches 
are matched, so output {c, c}, should it be like this?
    (a|~b)a with strategy SKIP_TILL_NEXT, when event a comes, output {a, a}? 

Please have a look at my design doc 
https://docs.google.com/document/d/1YNjOYF7BagM4agx_TI6hQkmraVLT9ZpKhBsgHDGi-U8/edit#.

> Support branching CEP patterns 
> -------------------------------
>
>                 Key: FLINK-4641
>                 URL: https://issues.apache.org/jira/browse/FLINK-4641
>             Project: Flink
>          Issue Type: Sub-task
>          Components: CEP
>            Reporter: Till Rohrmann
>            Assignee: Dian Fu
>
> We should add support for branching CEP patterns to the Pattern API. 
> {code}
>     |--> B --|
>     |        |
> A --         --> D
>     |        |
>     |--> C --|
> {code}
> This feature will require changes to the {{Pattern}} class and the 
> {{NFACompiler}}.



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