override and include optimize.
// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
-#include <vespa/vespalib/objects/serializer.h>
-#include <vespa/vespalib/objects/deserializer.h>
+namespace vespalib { class IFieldBase; }
namespace search {
namespace expression {
