text: -- @testpoint: opengauss关键字Identity(非保留)，作为函数名，部分测试点合理报错
  
  --关键字不带引号-成功
  drop function if exists Identity;
  create function Identity(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  drop function if exists Identity;
  
  --关键字带双引号-成功
  drop function if exists "Identity";
  create function "Identity"(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  drop function if exists "Identity";
  
  --关键字带单引号-合理报错
  drop function if exists 'Identity';
  create function 'Identity'(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  
  --关键字带反引号-合理报错
  drop function if exists `Identity`;
  create function `Identity`(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /