code: public static ReplacedStep from(Topology topology) {
          ReplacedStep replacedStep = new ReplacedStep<>();
          replacedStep.step = null;
          replacedStep.labels = new HashSet<>();
          replacedStep.topology = topology;
          replacedStep.fake = true;
          return replacedStep;
      }
docs: Used for SqlgVertexStepStrategy. It is a fake ReplacedStep to simulate the incoming vertex from which the traversal continues.
  
  @param topology
  @return