public int compareTo(HiveCharWritable rhs) {
    return getStrippedValue().compareTo(rhs.getStrippedValue());
  }
HiveCharWritable.
String values will be padded to full char length.
Character length, comparison, hashCode should ignore trailing spaces.
serde/src/java/org/apache/hadoop/hive/serde2/io/HiveCharWritable.java