presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/index/ColumnCardinalityCache.java/ColumnCardinalityCache/isExact
class ColumnCardinalityCache:    private static boolean isExact(Range range)
    {
        return !range.isInfiniteStartKey() && !range.isInfiniteStopKey() &&
                range.getStartKey().followingKey(PartialKey.ROW).equals(range.getEndKey());
    }