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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7147) Support greedy quantifier in CEP
Date Tue, 25 Jul 2017 10:23:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099830#comment-16099830
] 

ASF GitHub Bot commented on FLINK-7147:
---------------------------------------

Github user dawidwys commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4296#discussion_r129261577
  
    --- Diff: flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/pattern/Quantifier.java
---
    @@ -105,6 +107,14 @@ public void optional() {
     		properties.add(Quantifier.QuantifierProperty.OPTIONAL);
     	}
     
    +	public void greedy() {
    +		greedy = true;
    --- End diff --
    
    How about applying greedy to SINGLETON state? I think it is illegal combination. Also
maybe change GREEDY into `QuantifierProperty`? It will decrease the number of methods/fields.


> Support greedy quantifier in CEP
> --------------------------------
>
>                 Key: FLINK-7147
>                 URL: https://issues.apache.org/jira/browse/FLINK-7147
>             Project: Flink
>          Issue Type: Sub-task
>          Components: CEP, Table API & SQL
>            Reporter: Dian Fu
>            Assignee: Dian Fu
>
> Greedy quantifier will try to match the token as many times as possible. For example,
for pattern {{a b* c}} (skip till next is used) and inputs {{a b1 b2 c}}, if the quantifier
for {{b}} is greedy, it will only output {{a b1 b2 c}}.



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