[
https://issues.apache.org/jira/browse/FLINK-10470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Dawid Wysakowicz updated FLINK-10470:
-------------------------------------
Description: 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.
> 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
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
