public void putToAttributes(java.nio.ByteBuffer key, java.nio.ByteBuffer val) {
    if (this.attributes == null) {
      this.attributes = new java.util.HashMap<java.nio.ByteBuffer,java.nio.ByteBuffer>();
    }
    this.attributes.put(key, val);
  }
Returns true if field columns is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/TIncrement.java