public Append addColumn(byte[] family, byte[] qualifier, byte[] value) {
    KeyValue kv = new KeyValue(this.row, family, qualifier, this.ts, KeyValue.Type.Put, value);
    return add(kv);
  }
Add the specified column and value to this Append operation.
@param family    family name
@param qualifier column qualifier
@param value     value to append to specified column
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Append.java