docs: private ColumnDef addColumnFor(FieldDescriptorDef fieldDef, TableDef tableDef)
      {
          String    name      = fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_COLUMN);
          ColumnDef columnDef = tableDef.getColumn(name);
  
          if (columnDef == null)
          {
              columnDef = new ColumnDef(name);
              tableDef.addColumn(columnDef);
          }
          if (!fieldDef.isNested())
          {    
              columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_JAVANAME, fieldDef.getName());
          }
          columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_TYPE, fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_JDBC_TYPE));
          columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_ID, fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_ID));
          if (fieldDef.getBooleanProperty(PropertyHelper.OJB_PROPERTY_PRIMARYKEY, false))
          {
              columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_PRIMARYKEY, "true");
              columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_REQUIRED, "true");
          }
          else if (!fieldDef.getBooleanProperty(PropertyHelper.OJB_PROPERTY_NULLABLE, true))
          {
              columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_REQUIRED, "true");
          }
          if ("database".equals(fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_AUTOINCREMENT)))
          {
              columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_AUTOINCREMENT, "true");
          }
          columnDef.setProperty(PropertyHelper.TORQUE_PROPERTY_SIZE, fieldDef.getSizeConstraint());
          if (fieldDef.hasProperty(PropertyHelper.OJB_PROPERTY_DOCUMENTATION))
          {
              columnDef.setProperty(PropertyHelper.OJB_PROPERTY_DOCUMENTATION,
                                    fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_DOCUMENTATION));
          }
          if (fieldDef.hasProperty(PropertyHelper.OJB_PROPERTY_COLUMN_DOCUMENTATION))
          {
              columnDef.setProperty(PropertyHelper.OJB_PROPERTY_COLUMN_DOCUMENTATION,
                                    fieldDef.getProperty(PropertyHelper.OJB_PROPERTY_COLUMN_DOCUMENTATION));
          }
          return columnDef;
      }