docs: private FieldDescriptor[] getExtentFieldDescriptors(TableAlias extAlias, FieldDescriptor[] fds)
      {
          FieldDescriptor[] result = new FieldDescriptor[fds.length];
  
          for (int i = 0; i < fds.length; i++)
          {
              result[i] = extAlias.cld.getFieldDescriptorByName(fds[i].getAttributeName());
          }
  
          return result;
      }