1.数据库版本
Teradata 15.10
2.测试案例：
create multiset table test_stg (
col1 varchar(10) CHARACTER SET LATIN not null
);
create multiset table test_pdm(
col1 varchar(5) CHARACTER SET LATIN not null
);
insert into test_stg values('测超长错误');
insert into test_pdm select col1 from test_stg; sel * from test_pdm;