Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4355#discussion_r130071770
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/dataview/ListViewSerializer.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.table.dataview
+
+import org.apache.flink.annotation.Internal
+import org.apache.flink.api.common.typeutils._
+import
org.apache.flink.api.common.typeutils.base.{CollectionSerializerConfigSnapshot,
ListSerializer}
+import org.apache.flink.core.memory.{DataInputView, DataOutputView}
+import org.apache.flink.table.api.dataview.ListView
+
+/**
+ * A serializer for [[HeapListView]]. The serializer relies on an element
+ * serializer for the serialization of the list's elements.
+ *
+ * <p>The serialization format for the list is as follows: four bytes for
the length of the lost,
+ * followed by the serialized representation of each element.
+ *
+ * @param listSerializer List serializer.
+ * @tparam T The type of element in the list.
+ */
+@Internal
+class ListViewSerializer[T](listSerializer: ListSerializer[T])
+ extends TypeSerializer[ListView[T]] {
+
+ override def isImmutableType: Boolean = listSerializer.isImmutableType
+
+ override def duplicate(): TypeSerializer[ListView[T]] = {
+ new
ListViewSerializer[T](listSerializer.duplicate().asInstanceOf[ListSerializer[T]])
+ }
+
+ override def createInstance(): ListView[T] = new
HeapListView[T](listSerializer.createInstance())
+
+ override def copy(from: ListView[T]): ListView[T] = {
+ val list = from.asInstanceOf[HeapListView[T]].list
+ new HeapListView[T](listSerializer.copy(list))
+ }
+
+ override def copy(from: ListView[T], reuse: ListView[T]): ListView[T] =
copy(from)
+
+ override def getLength: Int = -1
+
+ override def serialize(record: ListView[T], target: DataOutputView):
Unit = {
+ val list = record.asInstanceOf[HeapListView[T]].list
+ listSerializer.serialize(list, target)
+ }
+
+ override def deserialize(source: DataInputView): ListView[T] =
+ new HeapListView[T](listSerializer.deserialize(source))
+
+ override def deserialize(reuse: ListView[T], source: DataInputView):
ListView[T] =
+ deserialize(source)
+
+ override def copy(source: DataInputView, target: DataOutputView): Unit =
+ listSerializer.copy(source, target)
+
+ override def canEqual(obj: scala.Any): Boolean = obj != null &&
obj.getClass == getClass
+
+ override def hashCode(): Int = listSerializer.hashCode()
+
+ override def equals(obj: Any): Boolean = canEqual(this) &&
+ listSerializer.equals(obj.asInstanceOf[ListSerializer[_]])
--- End diff --
There is `SerializerTestBase` which can be used to implement unit tests for
`TypeSerializer`
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