Database.java

    @Override
    public Map<TObject, Set<Long>> browse(String key) {
        Map<TObject, Set<Long>> test = Transformers.transformTreeMapSet(getSecondaryRecord(Text.wrap(key))
                .browse(), Functions.VALUE_TO_TOBJECT,
                Functions.PRIMARY_KEY_TO_LONG, TObjectSorter.INSTANCE);
        Variables.register("=== JUST FOR FUN ", test);  // test is TreeMap when use debugger to trace
                                                        // test is also TreeMap when run with StoreTest.java
        return test;
    }