public void decreaseTableDevice(final String table, final long decrease) {
    tableDeviceNumber.computeIfPresent(table, (tableName, num) -> num - decrease);
  }
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