code: @Override
      public CloseableIterator<ZooHandleImpl> oidIterator(ZooClassProxy clsPx, boolean subClasses) {
          SchemaIndexEntry se = schemaIndex.getSchema(clsPx.getSchemaId());
          if (se == null) {
              throw new IllegalStateException("Schema not found for class: " + clsPx);
          }
  
          return new ZooHandleIteratorAdapter(se.getObjectIndexIterator(), objectReader, cache);
      }
docs: Read objects.
  Only required for queries without index, which is worth a warning anyway.
  SEE readAllObjects()!
  @param clsPx ClassProxy
  @param subClasses whether to include subclasses