private Object getValuesFromMap(String key) {
    MemoryIndexStore ind = (MemoryIndexStore) ((CompactRangeIndex) index).getIndexStorage();
    Map map = ind.valueToEntriesMap;
    Object entryValue = map.get(key);
    return entryValue;
  }
Tests adding entries to compact range index where there are undefined and null values
for the key
geode-core/src/integrationTest/java/org/apache/geode/cache/query/internal/index/CompactRangeIndexJUnitTest.java