mjsax commented on code in PR #13249:
URL: https://github.com/apache/kafka/pull/13249#discussion_r1107868729


##########
streams/src/main/java/org/apache/kafka/streams/state/internals/NullableValueAndTimestampDeserializer.java:
##########
@@ -0,0 +1,99 @@
+/*
+ * 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.kafka.streams.state.internals;
+
+import static 
org.apache.kafka.streams.kstream.internals.WrappingNullableUtils.initNullableDeserializer;
+
+import java.util.Map;
+import java.util.Objects;
+import org.apache.kafka.common.serialization.Deserializer;
+import org.apache.kafka.common.serialization.LongDeserializer;
+import org.apache.kafka.streams.kstream.internals.WrappingNullableDeserializer;
+import org.apache.kafka.streams.processor.internals.SerdeGetter;
+import org.apache.kafka.streams.state.ValueAndTimestamp;
+import 
org.apache.kafka.streams.state.internals.NullableValueAndTimestampSerde.BooleanSerde.BooleanDeserializer;
+
+/**
+ * See {@link NullableValueAndTimestampSerde}.
+ */
+public class NullableValueAndTimestampDeserializer<V> implements 
WrappingNullableDeserializer<ValueAndTimestamp<V>, Void, V> {
+    public final Deserializer<V> valueDeserializer;
+    private final Deserializer<Long> timestampDeserializer;
+    private final Deserializer<Boolean> booleanDeserializer;
+
+    NullableValueAndTimestampDeserializer(final Deserializer<V> 
valueDeserializer) {
+        this.valueDeserializer = Objects.requireNonNull(valueDeserializer);
+        timestampDeserializer = new LongDeserializer();
+        booleanDeserializer = new BooleanDeserializer();
+    }
+
+    @Override
+    public void configure(final Map<String, ?> configs, final boolean isKey) {
+        valueDeserializer.configure(configs, isKey);
+        timestampDeserializer.configure(configs, isKey);
+        booleanDeserializer.configure(configs, isKey);
+    }
+
+    @Override
+    public ValueAndTimestamp<V> deserialize(final String topic, final byte[] 
rawValueAndTimestamp) {
+        if (rawValueAndTimestamp == null) {
+            return null;
+        }
+
+        final long timestamp = timestampDeserializer.deserialize(topic, 
rawTimestamp(rawValueAndTimestamp));
+        final boolean isTombstone = booleanDeserializer.deserialize(topic, 
rawIsTombstone(rawValueAndTimestamp));
+        if (isTombstone) {
+            return ValueAndTimestamp.makeAllowNullable(null, timestamp);
+        } else {
+            final V value = valueDeserializer.deserialize(topic, 
rawValue(rawValueAndTimestamp));
+            return ValueAndTimestamp.makeAllowNullable(value, timestamp);

Review Comment:
   I see. Guess it's fine as-is, using `makeAllowNullable`



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