text: --  @testpoint:openGauss关键字tables(非保留)，作为列名带单引号,合理报错
  
  drop table if exists explain_test;
  create table explain_test(
  	c_id int, c_int int, c_integer integer, c_bool int, c_boolean int, c_bigint integer, 
  	c_real real, c_double real, 
  	c_decimal decimal(38), c_number number(38), c_numeric numeric(38), 
  	c_char char(50) default null, c_varchar varchar(20), c_varchar2 varchar2(4000),
  	c_date date, c_datetime date, c_timestamp timestamp,
  	'tables' varchar(100)
  );
  