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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