Github user wuchong commented on a diff in the pull request: https://github.com/apache/flink/pull/4355#discussion_r128495770 --- 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 {@link 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 = canEqual(this) && + listSerializer.equals(obj.asInstanceOf[ListSerializer[_]]) + + override def hashCode(): Int = listSerializer.hashCode() + + override def equals(obj: Any): Boolean = obj != null && obj.getClass == getClass --- End diff -- The implementation should be ``` canEquals(this) && listSerializer.equals(obj.asInstanceOf[ListSerialize[_]]) ```
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