public Map<String, String> readTags(IMeasurementMNode<?> node) {
    try {
      return readTagFile(node.getOffset()).getLeft();
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
Read the tags of this node.

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