Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1905#discussion_r60399384
--- Diff:
flink-libraries/flink-cep-scala/src/main/scala/org/apache/flink/cep/scala/PatternStream.scala
---
@@ -0,0 +1,142 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.flink.cep.scala
+
+import java.util.{Map => JMap}
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.cep.{PatternFlatSelectFunction,
PatternSelectFunction, PatternStream => JPatternStream}
+import org.apache.flink.streaming.api.scala._
+import org.apache.flink.util.Collector
+import scala.reflect.ClassTag
+
+/**
+ * Stream abstraction for CEP pattern detection. A pattern stream is a
stream which emits detected
+ * pattern sequences as a map of events associated with their names. The
pattern is detected using a
+ * { @link org.apache.flink.cep.nfa.NFA}. In order to process the
detected sequences, the user
+ * has to specify a { @link PatternSelectFunction} or a { @link
PatternFlatSelectFunction}.
+ *
+ * @param jPatternStream Underlying pattern stream from Java API
+ * @tparam T Type of the events
+ */
+class PatternStream[T: TypeInformation : ClassTag](jPatternStream:
JPatternStream[T]) {
+
+ private[flink] def getWrappedPatternStream = jPatternStream
+
+ /**
+ * Applies a select function to the detected pattern sequence. For each
pattern sequence the
+ * provided { @link PatternSelectFunction} is called. The pattern
select function can produce
+ * exactly one resulting element.
+ *
+ * @param patternSelectFunction The pattern select function which is
called for each detected
+ * pattern sequence.
+ * @tparam R Type of the resulting elements
+ * @return { @link DataStream} which contains the resulting elements
from the pattern select
+ * unction.
+ */
+ def select[R: TypeInformation : ClassTag](patternSelectFunction:
PatternSelectFunction[T, R]): DataStream[R] = {
--- End diff --
`ClassTag` not needed
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