Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1704#discussion_r58244518
--- Diff:
flink-scala/src/main/scala/org/apache/flink/api/scala/extensions/impl/acceptPartialFunctions/OnDataSet.scala
---
@@ -0,0 +1,111 @@
+/*
+ * 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.api.scala.extensions.impl.acceptPartialFunctions
+
+import org.apache.flink.api.common.typeinfo.TypeInformation
+import org.apache.flink.api.scala.{DataSet, GroupedDataSet}
+
+import scala.reflect.ClassTag
+
+/**
+ * Wraps a data set, allowing to use anonymous partial functions to
+ * perform extraction of items in a tuple, case class instance or
collection
+ *
+ * @param ds The wrapped data set
+ * @tparam T The type of the data set items, for which the type
information must be known
+ */
+class OnDataSet[T: TypeInformation](ds: DataSet[T]) {
--- End diff --
I think you do not need the `TypeInformation` context bound here. Functions
should never need the implicit type info for the input (that is contained in
the DataSet already), only ever for the return type.
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