@Override
  public CachedSchemaEngineStatistics getAsCachedSchemaEngineStatistics() {
    return this;
  }
This class is used to record global statistics for SchemaEngine in PBTree mode, which is a
superset of the statistics in Memory mode.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/rescon/CachedSchemaEngineStatistics.java