@Override
  public long getTableAttributeMemory(final String table) {
    final Long memorySize = tableAttributeMemory.get(table);
    return Objects.nonNull(memorySize) ? memorySize : 0;
  }
This class is used to record statistics within the SchemaRegion in Memory mode.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/rescon/MemSchemaRegionStatistics.java