Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/4320#discussion_r132446175
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/PatternStream.java
---
@@ -213,14 +321,97 @@
* @return {@link DataStream} which contains the resulting elements
from the pattern flat select
* function.
*/
- public <R> SingleOutputStreamOperator<R> flatSelect(final
PatternFlatSelectFunction<T, R> patternFlatSelectFunction, TypeInformation<R>
outTypeInfo) {
- SingleOutputStreamOperator<Map<String, List<T>>> patternStream =
-
CEPOperatorUtils.createPatternStream(inputStream, pattern);
-
- return patternStream.flatMap(
- new PatternFlatSelectMapper<>(
-
patternStream.getExecutionEnvironment().clean(patternFlatSelectFunction)
- )).returns(outTypeInfo);
+ public <R> SingleOutputStreamOperator<R> flatSelect(
+ final PatternFlatSelectFunction<T, R>
patternFlatSelectFunction,
+ final TypeInformation<R> outTypeInfo) {
+ return CEPOperatorUtils.createPatternStream(
+ inputStream,
+ pattern,
+ clean(patternFlatSelectFunction),
+ outTypeInfo);
+ }
+
+ /**
+ * Applies a flat select function to the detected pattern sequence. For
each pattern sequence the
+ * provided {@link PatternFlatSelectFunction} is called. The pattern
select function can produce
+ * exactly one resulting element.
+ *
+ * <p>Applies a timeout function to a partial pattern sequence which
has timed out. For each
+ * partial pattern sequence the provided {@link
PatternFlatTimeoutFunction} is called. The pattern
+ * timeout function can produce exactly one resulting element.
+ *
+ * <p>You can get the stream of late data using
--- End diff --
Same as above.
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