@Override
    public RefDataValueProxy merge(final RefDataValueProxy additionalProxy) {
        return MultiRefDataValueProxy.merge(this, additionalProxy);
    }
If a reference data entry exists for this {@link SingleRefDataValueProxy} pass its value to the consumer
as a {@link TypedByteBuffer}.

@param typedByteBufferConsumer
@return True if the entry is found and the consumer is called.
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/SingleRefDataValueProxy.java