text: --  @testpoint:opengauss关键字whenever(非保留)，作为视图名
  
  
  --关键字explain作为视图名，不带引号，创建成功
  CREATE or replace VIEW whenever AS
  SELECT * FROM pg_tablespace WHERE spcname = 'pg_default';
  drop view whenever;
  
  --关键字explain作为视图名，加双引号，创建成功
  CREATE  or replace VIEW "whenever" AS
  SELECT * FROM pg_tablespace WHERE spcname = 'pg_default';
  drop VIEW "whenever";
  
  --关键字explain作为视图名，加单引号，合理报错
  CREATE or replace VIEW 'whenever' AS
  SELECT * FROM pg_tablespace WHERE spcname = 'pg_default';
  
  --关键字explain作为视图名，加反引号，合理报错
  CREATE or replace VIEW `whenever` AS
  SELECT * FROM pg_tablespace WHERE spcname = 'pg_default';
  
  