text: -- @testpoint: 数字操作符&(二进制AND), 两个负整数进行二进制AND
  drop table if exists data_01;
  create table data_01 (clo1 int,clo2 SMALLINT);
  insert into data_01 values (-255, -32767);
  select clo1 & clo2 from data_01;
  SELECT -91 & -15  AS RESULT;
  drop table if exists data_01;