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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/02/20 11:06:44 UTC
[jira] [Commented] (FLINK-3318) Add support for quantifiers to
CEP's pattern API
[ https://issues.apache.org/jira/browse/FLINK-3318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15874370#comment-15874370 ]
ASF GitHub Bot commented on FLINK-3318:
---------------------------------------
Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/2361
Hi @mushketyk are you still working on this issue?
In not, @dawidwys would also like to work on this issue.
Please let me know what you think.
> Add support for quantifiers to CEP's pattern API
> ------------------------------------------------
>
> Key: FLINK-3318
> URL: https://issues.apache.org/jira/browse/FLINK-3318
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Affects Versions: 1.0.0
> Reporter: Till Rohrmann
> Assignee: Ivan Mushketyk
> Priority: Minor
>
> It would be a good addition to extend the pattern API to support quantifiers known from regular expressions (e.g. Kleene star, ?, +, or count bounds). This would considerably enrich the set of supported patterns.
> Implementing the count bounds could be done by unrolling the pattern state. In order to support the Kleene star operator, the {{NFACompiler}} has to be extended to insert epsilon-transition between a Kleene start state and the succeeding pattern state. In order to support {{?}}, one could insert two paths from the preceding state, one which accepts the event and another which directly goes into the next pattern state.
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