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https://issues.apache.org/jira/browse/FLINK-9507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16499467#comment-16499467
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aitozi commented on FLINK-9507:
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Hi [~kkl0u]
Thanks for your quick answer, I have apply the patch
[https://github.com/apache/flink/pull/6059] in our inner flink cep library
today, i think it is a good improve to CEP, and i will then design the
implemention of the reduceFunction in CEP based on that PR these day and ask
you to review it , thanks ;)
> Introduce ReduceFunction to CEP to minor the cost for IterativeCondition
> ------------------------------------------------------------------------
>
> Key: FLINK-9507
> URL: https://issues.apache.org/jira/browse/FLINK-9507
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Affects Versions: 1.5.0
> Reporter: aitozi
> Assignee: aitozi
> Priority: Major
> Fix For: 1.6.0
>
>
> When we use the cep to describe a condition about the events that has been
> matched, we have to call the method "getEventsForPattern" to extract the
> partly matched elements from the sharedBuffer in RocksDB, which is very cost,
> I think we can introduce a ReduceFunction on the pattern desc to allow us to
> aggregate the value in advance. Is this practical ？ What's your guys
> opinion? [~kkl0u] [~dawidwys]
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