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https://issues.apache.org/jira/browse/FLINK-26941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17515104#comment-17515104
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Nicholas Jiang commented on FLINK-26941:
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[~mayuehappy], does this improve affect the Flink 1.15.1?
> Support Pattern end with notFollowedBy with window
> --------------------------------------------------
>
> Key: FLINK-26941
> URL: https://issues.apache.org/jira/browse/FLINK-26941
> Project: Flink
> Issue Type: Improvement
> Components: Library / CEP
> Affects Versions: 1.14.4
> Reporter: Yue Ma
> Priority: Major
> Fix For: 1.14.4
>
>
> Currently a pattern sequence cannot end in notFollowedBy() in Flink CEP. But
> in fact, this requirement exists in many scenarios. As mentioned in the
> following tickets：
> https://issues.apache.org/jira/browse/FLINK-16010
> https://issues.apache.org/jira/browse/FLINK-9431
> Unfortunately, these tickets are not active for a long time.But we still
> think this is an important feature for Flink CEP, so we would like to share
> our implementation.
> if we want to find the users who created an order but didn't pay in 10
> minutes. We could code like this:
> Pattern.begin('create').notFollowedBy('pay_order').withIn(10min)
> If we receive the create event but don't receive the pay event within 10
> minutes, then the match will be successful.
> The idea of implementation is basically the same as the design of FLINK-16010.
> A Pending State is introduced to represent the state of waiting for a
> timeout, and there is a take edge between the Pending node and the Stop node.
> When advanceTime, if it is found that the pending node has timed out, then
> extract the timeout sequence and output it normally as successed matched
> sequence.
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