@Override
  public PlanNodeType getType() {
    return PlanNodeType.SCHEMA_FETCH_MERGE;
  }
This class defines the scanned result merge task of schema fetcher.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/metadata/read/SchemaFetchMergeNode.java