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From "Yueting Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7169) Support AFTER MATCH SKIP function in CEP library API
Date Thu, 13 Jul 2017 09:05:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085404#comment-16085404
] 

Yueting Chen commented on FLINK-7169:
-------------------------------------

[~jark] Thanks.

I just found out that the events stored in sharedbuffer may have the same timestamp, which
makes it impossible to determine which event should be discarded. I think we need to introduce
a new variable to keep the logical order of the events.

I'll create a seperate JIRA to address this issue.

> Support AFTER MATCH SKIP function in CEP library API
> ----------------------------------------------------
>
>                 Key: FLINK-7169
>                 URL: https://issues.apache.org/jira/browse/FLINK-7169
>             Project: Flink
>          Issue Type: Sub-task
>          Components: CEP
>            Reporter: Yueting Chen
>            Assignee: Yueting Chen
>
> In order to support Oracle's MATCH_RECOGNIZE on top of the CEP library, we need to support
AFTER MATCH SKIP function in CEP API.
> There're four options in AFTER MATCH SKIP, listed as follows:
> 1. AFTER MATCH SKIP TO NEXT ROW: resume pattern matching at the row after the first row
of the current match.
> 2. AFTER MATCH SKIP PAST LAST ROW: resume pattern matching at the next row after the
last row of the current match.
> 3. AFTER MATCH SKIP TO FIST *RPV*: resume pattern matching at the first row that is mapped
to the row pattern variable RPV.
> 4. AFTER MATCH SKIP TO LAST *RPV*: resume pattern matching at the last row that is mapped
to the row pattern variable RPV.
> I think we can introduce a new function to `CEP` class, which takes a new parameter as
AfterMatchSKipStrategy.
> The new API may looks like this
> {code}
> public static <T> PatternStream<T> pattern(DataStream<T> input, Pattern<T,
?> pattern, AfterMatchSkipStrategy afterMatchSkipStrategy) 
> {code}
> We can also make `SKIP TO NEXT ROW` as the default option, because that's what CEP library
behaves currently.



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