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