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https://issues.apache.org/jira/browse/FLINK-2457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14659941#comment-14659941
]
ASF GitHub Bot commented on FLINK-2457:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/983#discussion_r36408488
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/typeutils/runtime/Tuple0Serializer.java
---
@@ -0,0 +1,86 @@
+/*
+ * 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.java.typeutils.runtime;
+
+import java.io.IOException;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.api.java.tuple.Tuple0;
+import org.apache.flink.core.memory.DataInputView;
+import org.apache.flink.core.memory.DataOutputView;
+
+public class Tuple0Serializer extends TupleSerializer<Tuple0> {
+ private static final long serialVersionUID = 1278813169022975971L;
+
+ public Tuple0Serializer() {
+ super(Tuple0.class, new TypeSerializer<?>[0]);
+ }
+
+ @Override
+ public Tuple0Serializer duplicate() {
+ return new Tuple0Serializer();
--- End diff --
No need to create a new instance, since this is stateless.
> Integrate Tuple0
> ----------------
>
> Key: FLINK-2457
> URL: https://issues.apache.org/jira/browse/FLINK-2457
> Project: Flink
> Issue Type: Improvement
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Minor
>
> Tuple0 is not cleanly integrated:
> - missing serialization/deserialization support in runtime
> - Tuple.getTupleClass(int arity) cannot handle arity zero, ie, cannot create
> an instance of Tuple0
> Tuple0 is currently only used in Python API, but will be integrated into
> Storm compatibility, too.
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