@Override
  public Optional<TDataNodeLocation> getDataNodeLocation() {
    Preconditions.checkArgument(dataNodeLocation != null);
    return Optional.of(dataNodeLocation);
  }
QueryExecutor indicates this query can execute directly without data from StorageEngine
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/partition/QueryExecutor.java