@Override
    public CheckAndMutateBuilder qualifier(byte[] qualifier) {
      this.qualifier = Preconditions.checkNotNull(qualifier, "qualifier is null. Consider using"
        + " an empty byte array, or just do not call this method if you want a null qualifier");
      return this;
    }
Create the closest row after the specified row
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/client/ThriftTable.java