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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10470) Add method to check if pattern can produce empty matches
Date Thu, 04 Oct 2018 08:08:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16637919#comment-16637919
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ASF GitHub Bot commented on FLINK-10470:
----------------------------------------

dawidwys commented on issue #6781: [FLINK-10470] Add method to check if pattern can produce
empty matches
URL: https://github.com/apache/flink/pull/6781#issuecomment-426924231
 
 
   @pnowojski could you have another look?

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> Add method to check if pattern can produce empty matches
> --------------------------------------------------------
>
>                 Key: FLINK-10470
>                 URL: https://issues.apache.org/jira/browse/FLINK-10470
>             Project: Flink
>          Issue Type: Sub-task
>          Components: CEP
>            Reporter: Dawid Wysakowicz
>            Assignee: Dawid Wysakowicz
>            Priority: Major
>              Labels: pull-request-available
>
> There is couple of inconsistencies how CEP library handles greedy and reluctant operators
at the beginning at end of pattern. This results in subtle problems how empty matches should
be generated for patterns like e.g. A? or A*?, where one is greedy and the other one is reluctant.
In order to provide first version of MATCH_RECOGNIZE function we should have a possibility
to disable patterns which can produce empty matches.



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