private static boolean matchingColumn(final Cell left, final byte lFamLen, final int lQualLength,
    final Cell right, final byte rFamLen, final int rQualLength) {
    if (!matchingFamily(left, lFamLen, right, rFamLen)) {
      return false;
    }
    return matchingQualifier(left, lQualLength, right, rQualLength);
  }
Returns True if matching column family and the qualifier starts with <code>qual</code>
hbase-common/src/main/java/org/apache/hadoop/hbase/CellUtil.java