Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4418#discussion_r130564756
--- 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 --
could you describe in the doc when the operator is applied.
E.g the comparator is used for sorting events with the same timestamp in
case of EventTime or that arrived at the same moment.
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