public String getSqlDialect() {
    if (params != null && StringUtils.isNotBlank(params.getSqlDialect())) {
      return params.getSqlDialect();
    } else {
      return "tree";
    }
  }
ConnectionTimeout and SocketTimeout. Unit: ms. If not set, default value 0 will be used, which
means that there's no timeout in the client side.
iotdb-client/jdbc/src/main/java/org/apache/iotdb/jdbc/IoTDBConnection.java