mjsax commented on code in PR #10747:
URL: https://github.com/apache/kafka/pull/10747#discussion_r1093813869
##########
streams/src/main/java/org/apache/kafka/streams/kstream/internals/ChangedSerializer.java:
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@@ -46,33 +45,40 @@ public void setIfUnset(final SerdeGetter getter) {
}
/**
- * @throws StreamsException if both old and new values of data are null,
or if
- * both values are not null
+ * @throws StreamsException if both old and new values of data are null.
*/
@Override
public byte[] serialize(final String topic, final Headers headers, final
Change<T> data) {
- final byte[] serializedKey;
-
- // only one of the old / new values would be not null
- if (data.newValue != null) {
- if (data.oldValue != null) {
- throw new StreamsException("Both old and new values are not
null (" + data.oldValue
- + " : " + data.newValue + ") in ChangeSerializer, which is
not allowed.");
- }
-
- serializedKey = inner.serialize(topic, headers, data.newValue);
+ final boolean oldValueIsNull = data.oldValue == null;
+ final boolean newValueIsNull = data.newValue == null;
+
+ final byte[] newData = inner.serialize(topic, headers, data.newValue);
+ final byte[] oldData = inner.serialize(topic, headers, data.oldValue);
+
+ final int newDataLength = newValueIsNull ? 0 : newData.length;
+ final int oldDataLength = oldValueIsNull ? 0 : oldData.length;
Review Comment:
The implicit contract is, that `inner.serialize` can only return `null` if
`data.oldValue` is `null`. Otherwise, the serializer has a bug. Hence, we
should never hit a NPE here (or accept to hit it, to surface the bug in the
serializer)
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