hive中将string数据转为bigint的操作

使用 CAST 函数将 STRING 转为 BIGINT:

SELECT CAST('00321' AS BIGINT) FROM table;

As a BIGINT it will show on the screen and in delimited text files as 321.

参考：Hive - Converting a string to bigint

补充知识：hive中bigint和varchar字段做关联，关联数据错误的解决方法

把bigint和varchar都隐式转换成String类型的就可以关联出正确的结果了

cast(t1.PARTY_NUM as string)=cast(t12.customerId as string)