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