@Override
  public List<PlanNode> visitGapFill(GapFillNode node, PlanContext context) {
    context.clearExpectedOrderingScheme();
    return dealWithPlainSingleChildNode(node, context);
  }
This class is used to generate distributed plan for table model.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/distribute/TableDistributedPlanGenerator.java