private int compareColumns(final Cell left, final int leftFamLen, final int leftQualLen,
    final Cell right, final int rightFamLen, final int rightQualLen) {
    int diff = compareFamilies(left, leftFamLen, right, rightFamLen);
    if (diff != 0) {
      return diff;
    }
    return compareQualifiers(left, leftQualLen, right, rightQualLen);
  }
Compares the family and qualifier part of the cell
@return 0 if both cells are equal, 1 if left cell is bigger than right, -1 otherwise
hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparatorImpl.java