public PlanNodeType getType() {
    throw new UnsupportedOperationException("This planNode does not support getType().");
  }
If this plan node has to be serialized or deserialized, override this method. If this method is
overridden, the serialization and deserialization methods must be implemented.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/PlanNode.java