private static String printRange(int ix, long[] log) {
    return "[" + log[ix] + ", " + log[ix + 1] + "): 0x" + Integer.toHexString((int)log[ix + 2]);
  }
Single threaded IO trace.
Note: this can be made MTT merely by using an AtomicInteger, and storing a thread ID.
ql/src/java/org/apache/hadoop/hive/ql/io/orc/encoded/IoTrace.java