public PlanNode createSubNode(int subNodeId, int startIndex, int endIndex) {
    throw new UnsupportedOperationException(
        String.format("Can't create subNode for %s", this.getClass()));
  }
Create sub node which has exactly the same function of origin node, only its children is a part
of it, which is composed by the [startIndex, endIndex) of origin children list.

@param subNodeId the sub node id
@param startIndex the start Index of origin children
@param endIndex the endIndex Index of origin children
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/PlanNode.java