private static boolean isAllTime(long minStamp, long maxStamp) {
    return minStamp == INITIAL_MIN_TIMESTAMP && maxStamp == INITIAL_MAX_TIMESTAMP;
  }
Represents interval [minStamp, maxStamp)
@param minStamp the minimum timestamp, inclusive
@param maxStamp the maximum timestamp, exclusive
@throws IllegalArgumentException if either <0,
hbase-common/src/main/java/org/apache/hadoop/hbase/io/TimeRange.java