@Override
    protected TensorFunction<Reference> lazyGetFunction() {
        if ( ! allInputFunctionsPresent(1)) return null;
        return new com.yahoo.tensor.functions.Rename<>(inputs.get(0).function().orElse(null), from, to);
    }
Renames a tensor dimension to relax dimension constraints

@author bratseth
model-integration/src/main/java/ai/vespa/rankingexpression/importer/operations/Rename.java