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https://issues.apache.org/jira/browse/FLINK-10470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16633854#comment-16633854
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ASF GitHub Bot commented on FLINK-10470:
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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-425868325
cc @kl0u @pnowojski
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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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