public void addToSortedColumns(TColumn elem) {
    if (this.sortedColumns == null) {
      this.sortedColumns = new java.util.ArrayList<TColumn>();
    }
    this.sortedColumns.add(elem);
  }
Returns true if field columns is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/generated/TRowResult.java