text: --  @testpoint:opengauss关键字preferred非保留)，作为序列名
  
  
  --关键字不带引号-成功
  drop sequence if exists preferred;
  create sequence preferred start 100 cache 50;
  drop sequence preferred;
  
  --关键字带双引号-成功
  drop sequence if exists "preferred";
  create sequence "preferred" start 100 cache 50;
  drop sequence "preferred";
  
  --关键字带单引号-合理报错
  drop sequence if exists 'preferred';
  create sequence 'preferred' start 100 cache 50;
  
  --关键字带反引号-合理报错
  drop sequence if exists `preferred`;
  create sequence `preferred` start 100 cache 50;
  