text: -- @testpoint: 数字操作符<<(二进制左移), 左移的位数为小数负数
  drop table if exists data_01;
  create table data_01 (clo1 int,clo2 int);
  insert into data_01 values (1, -32767);
  select  clo1<<5.56 , clo2 <<-5 from data_01;
  SELECT 1<<4.1 AS RESULT;
  drop table if exists data_01;