Github user dawidwys commented on a diff in the pull request:
https://github.com/apache/flink/pull/4563#discussion_r134157868
--- Diff:
flink-libraries/flink-cep-scala/src/main/scala/org/apache/flink/cep/scala/pattern/Pattern.scala
---
@@ -329,7 +332,7 @@ class Pattern[T , F <: T](jPattern: JPattern[T, F]) {
* @return The same pattern as optional.
* @throws MalformedPatternException if the quantifier is not
applicable to this pattern.
*/
- def optional: Pattern[T, F] = {
+ def optional = {
--- End diff --
Unrelated change
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