docs: private void updateMeta() {
      meta = new BundleMeta();
      BundleMeta origmeta = source.getMeta();
      for(int i = 0; i < origmeta.size(); i++) {
        SimpleTypeInformation<?> type = origmeta.get(i);
        if(column < 0) {
          // Test whether this type matches
          if(TypeUtil.NUMBER_VECTOR_VARIABLE_LENGTH.isAssignableFromType(type)) {
            if(type instanceof VectorFieldTypeInformation) {
              @SuppressWarnings("unchecked")
              final VectorFieldTypeInformation<V> castType = (VectorFieldTypeInformation<V>) type;
              if(dim != -1 && castType.mindim() > dim) {
                throw new AbortException("Would filter all vectors: minimum dimensionality " + castType.mindim() + " > desired dimensionality " + dim);
              }
              if(dim != -1 && castType.maxdim() < dim) {
                throw new AbortException("Would filter all vectors: maximum dimensionality " + castType.maxdim() + " < desired dimensionality " + dim);
              }
              if(dim == -1) {
                dim = castType.mindim();
              }
              if(castType.mindim() == castType.maxdim()) {
                meta.add(castType);
                column = i;
                continue;
              }
            }
            @SuppressWarnings("unchecked")
            final VectorTypeInformation<V> castType = (VectorTypeInformation<V>) type;
            if(dim != -1) {
              meta.add(new VectorFieldTypeInformation<>(FilterUtil.guessFactory(castType), dim, dim, castType.getSerializer()));
            }
            else {
              LOG.warning("No dimensionality yet for column " + i);
              meta.add(castType);
            }
            column = i;
            continue;
          }
        }
        meta.add(type);
      }
    }