@Override
  public void setTimeZoneOfSession(String zoneId) {
    defaultSessionConnection.setTimeZoneOfSession(zoneId);
    this.zoneId = ZoneId.of(zoneId);
  }
Only changes the member variable of the Session object without sending it to server.
iotdb-client/session/src/main/java/org/apache/iotdb/session/Session.java