@Override
  public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
    return visitor.visitOffset(this, context);
  }
OffsetNode is used to skip top n result from upstream nodes. It uses the default order of
upstream nodes
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/process/OffsetNode.java