@Override
    public ExpressionNode transform(ExpressionNode node, RankProfileTransformContext context) {
        if (node instanceof ReferenceNode r) {
            node = transformReference(r, context);
        }
        if (node instanceof CompositeNode composite) {
            node = transformChildren(composite, context);
        }
        return node;
    }
Recognizes pseudo-functions and creates global-phase normalizers
@author arnej
config-model/src/main/java/com/yahoo/schema/expressiontransforms/NormalizerFunctionExpander.java