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https://issues.apache.org/jira/browse/FLINK-7293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111029#comment-16111029
]
ASF GitHub Bot commented on FLINK-7293:
---------------------------------------
Github user dianfu commented on a diff in the pull request:
https://github.com/apache/flink/pull/4418#discussion_r130895852
--- Diff:
flink-libraries/flink-cep-scala/src/main/scala/org/apache/flink/cep/scala/CEP.scala
---
@@ -36,8 +38,26 @@ object CEP {
* @tparam T Type of the input events
* @return Resulting pattern stream
*/
- def pattern[T](input: DataStream[T], pattern: Pattern[T, _]):
PatternStream[T] = {
+ def pattern[T](input: DataStream[T], pattern: Pattern[T, _ <: T]):
PatternStream[T] = {
wrapPatternStream(JCEP.pattern(input.javaStream,
pattern.wrappedPattern))
}
+
+ /**
+ * Transforms a [[DataStream]] into a [[PatternStream]] in the Scala
API.
+ * See [[org.apache.flink.cep.CEP}]]for a more detailed description how
the underlying
+ * Java API works.
+ *
+ * @param input DataStream containing the input events
+ * @param pattern Pattern specification which shall be detected
+ * @param comparator Comparator to sort events
--- End diff --
Updated the doc.
> Support custom order by in PatternStream
> ----------------------------------------
>
> Key: FLINK-7293
> URL: https://issues.apache.org/jira/browse/FLINK-7293
> Project: Flink
> Issue Type: Sub-task
> Components: CEP
> Reporter: Dian Fu
> Assignee: Dian Fu
>
> Currently, when {{ProcessingTime}} is configured, the events are fed to NFA
> in the order of the arriving time and when {{EventTime}} is configured, the
> events are fed to NFA in the order of the event time. It should also allow
> custom {{order by}} to allow users to define the order of the events besides
> the above factors.
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