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Posted to issues@flink.apache.org by "Yueting Chen (JIRA)" <ji...@apache.org> on 2017/07/13 05:49:00 UTC
[jira] [Commented] (FLINK-7169) Support AFTER MATCH SKIP function
in CEP library API
[ https://issues.apache.org/jira/browse/FLINK-7169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085214#comment-16085214 ]
Yueting Chen commented on FLINK-7169:
-------------------------------------
I am going to work on this, but I would like to hear your thoughts first. [~dian.fu] [~dawidwys][~kkl0u]
> 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: 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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