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.
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