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https://issues.apache.org/jira/browse/FLINK-6927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069898#comment-16069898
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ASF GitHub Bot commented on FLINK-6927:
---------------------------------------
Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4153#discussion_r125005277
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/pattern/Pattern.java
---
@@ -430,6 +431,54 @@ public Quantifier getQuantifier() {
return this;
}
+ /**
+ * Starts a new pattern sequence. The provided pattern is the initial
pattern
+ * of the new sequence.
+ *
+ * @param group the pattern to begin with
+ * @return the first pattern of a pattern sequence
+ */
+ public static <T, F extends T> GroupPattern<T, F> begin(Pattern<T, F>
group) {
+ return new GroupPattern<>(null, group);
+ }
+
+ /**
+ * Appends a new pattern to the existing one. The new pattern enforces
non-strict
--- End diff --
I would update the docs, to put more stress that this method is used for
appending a group pattern.
> Support pattern group in CEP
> ----------------------------
>
> Key: FLINK-6927
> URL: https://issues.apache.org/jira/browse/FLINK-6927
> Project: Flink
> Issue Type: Sub-task
> Components: CEP
> Reporter: Dian Fu
> Assignee: Dian Fu
>
> We should add support for pattern group. This would enrich the set of
> supported patterns. For example, users can write patterns like this with this
> feature available:
> {code}
> A --> (B --> C.times(3)).optional() --> D
> {code}
> or
> {code}
> A --> (B --> C).times(3) --> D
> {code}
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