Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1217#discussion_r41126581
--- Diff:
flink-scala/src/main/scala/org/apache/flink/api/scala/typeutils/UnitSerializer.scala
---
@@ -0,0 +1,60 @@
+/*
+ * 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.typeutils
+
+import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton
+import org.apache.flink.core.memory.{DataInputView, DataOutputView}
+
+class UnitSerializer extends TypeSerializerSingleton[Unit] {
+
+ def isImmutableType: Boolean = true
+
+ def createInstance: Unit = ()
+
+ def copy(from: Unit): Unit = ()
+
+ def copy(from: Unit, reuse: Unit): Unit = ()
+
+ def getLength: Int = 1
+
+ def serialize(record: Unit, target: DataOutputView) {
+ target.write(0)
+ }
+
+ def deserialize(source: DataInputView): Unit = {
+ source.readByte
--- End diff --
The `readByte()` and `write()` method should have parenthesis (both for
semantics and to avoid confusion that the Unit parenthesis belong to the method
call...
I think we need an entry in the coding guidelines for Scala there (or
better, a style check), that because it seems that dropping the parenthesis
when Scala calls Java functions happens a bit too eagerly (I think most IDEs
make not very good suggestions there as well).
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