private void requestMemory(long size) {
    if (regionStatistics != null) {
      regionStatistics.requestMemory(size);
    }
  }
Read the attributes of this node.

@param node the node to query.
@return the attribute key-value map.
@throws RuntimeException If any IOException happens.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/tag/TagManager.java