@org.apache.thrift.annotation.Nullable
  public java.util.Iterator<TColumn> getSortedColumnsIterator() {
    return (this.sortedColumns == null) ? null : this.sortedColumns.iterator();
  }
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