text: --  @testpoint:opengauss关键字Indicator(非保留)，自定义数据类型名为explain
  --关键字explain作为数据类型不带引号，创建成功
  drop type if exists Indicator;
  CREATE TYPE Indicator AS (f1 int, f2 text);
  select typname from pg_type where typname ='Indicator';
  drop type Indicator;
  
  
  --关键字explain作为数据类型加双引号，创建成功
  drop type if exists "Indicator";
  CREATE TYPE "Indicator" AS (f1 int, f2 text);
  select typname from pg_type where typname ='Indicator';
  drop type "Indicator";
  
  --关键字explain作为数据类型加单引号，合理报错
  drop type if exists 'Indicator';
  CREATE TYPE 'Indicator' AS (f1 int, f2 text);
  select * from pg_type where typname ='Indicator';
  drop type 'Indicator';
  
  --关键字explain作为数据类型加反引号，合理报错
  drop type if exists `Indicator`;
  CREATE TYPE `Indicator` AS (f1 int, f2 text);
  select * from pg_type where typname =`Indicator`;
  drop type `Indicator`;