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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=16099829#comment-16099829
] 

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_r129262270
  
    --- Diff: flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/pattern/Pattern.java
---
    @@ -492,4 +506,10 @@ private void checkIfQuantifierApplied() {
     					"Current quantifier is: " + quantifier);
     		}
     	}
    +
    +	private void checkIfNoFollowedByAny() {
    +		if (quantifier.getConsumingStrategy() == ConsumingStrategy.SKIP_TILL_ANY) {
    --- End diff --
    
    I think it is a valid combination. I think the InnerConsumingStrategy should not be `SKIP_TILL_ANY`.
    
    So `followedByAny("loop").oneOrMore().greedy()` in my opinion is a valid one, but `followedByAny("loop").oneOrMore().allowCombinations().greedy()`
is not. 


> 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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