private static String renamesToString(Map<String, Integer> renames) {
        return renames.entrySet().stream()
                                 .map(e -> "  " + e.getKey() + " -> " + e.getValue())
                                 .collect(Collectors.joining("\n"));
    }
Retrieve resulting name of a dimension after solving for constraints, or empty if no
solution is found yet, or this dimension was not added before finding a solution.
model-integration/src/main/java/ai/vespa/rankingexpression/importer/DimensionRenamer.java