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