text: -- @testpoint: 插入正常值，字节长度设定为1
  -- @modify at: 2020-11-05
  
  drop table if exists test_char_03;
  create table test_char_03 (name char(1));
  insert into test_char_03 values ('a');
  select * from test_char_03;
  drop table test_char_03;
  