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