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https://issues.apache.org/jira/browse/FLINK-7169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16100037#comment-16100037
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ASF GitHub Bot commented on FLINK-7169:
---------------------------------------
Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4331#discussion_r129296465
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/CEP.java ---
@@ -36,6 +40,14 @@
* @return Resulting pattern stream
*/
public static <T> PatternStream<T> pattern(DataStream<T> input,
Pattern<T, ?> pattern) {
- return new PatternStream<>(input, pattern);
+ return new PatternStream<>(input, pattern, skipStrategy);
+ }
+
+ /**
+ * Set the pattern's skip strategy after match.
+ * @param afterMatchSkipStrategy the skip strategy to use.
+ */
+ public static void setAfterMatchSkipStrategy(AfterMatchSkipStrategy
afterMatchSkipStrategy) {
--- End diff --
As @dianfu said in the corresponding JIRA, the `AfterMatchSkipStrategy`
should be part of the `Pattern` not `PatternStream`.
> 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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