@Override
  public ConnectorTransactionHandle beginTransaction(
      IsolationLevel isolationLevel, boolean readOnly, boolean autoCommit) {
    checkConnectorSupports(SERIALIZABLE, isolationLevel);
    ConnectorTransactionHandle transaction = new HiveTransactionHandle(autoCommit);
    transactionManager.begin(transaction);
    return transaction;
  }
A Connector of mixed-format table to Trino
amoro-format-mixed/amoro-mixed-trino/src/main/java/org/apache/amoro/trino/MixedFormatConnector.java