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比如左表关联键是string类型，右表关联键是bigint类型，关联后会出现多条的情况

解决方案：

        关联键先统一转成string类型再进行关联

原因：

根据HIVE版本不同，数据位数上限不同，

低版本的超过16位会出现这种情况，高版本的超过19位会出现这种情况

以下为低版本HIVE数据测试情况：

select * 
from (select '3618693946106075234' as str_ord  -- 19位union allselect '361869394610607523' as str_ord  -- 18位union allselect '36186939461060752' as str_ord  -- 17位union allselect '3618693946106075' as str_ord  -- 16位) a
join (select 3618693946106075234  as int_Ordunion all select 3618693946106075233 as int_Ordunion all select 361869394610607523 as int_Ordunion all select 361869394610607524 as int_Ordunion allselect 36186939461060752 as int_Ord  -- 17位union allselect 36186939461060751 as int_Ord  -- 17位union allselect 3618693946106075 as int_Ord  -- 16位union allselect 3618693946106076 as int_Ord  -- 16位) b 
on a.str_ord  = b.int_Ord