hive报错：Both left and right aliases encountered in JOIN

Cause: The two tables join when the field is not supported two tables of non-equal operation.

Solution:
1, the unequal conditions to get the where clause

select ... from
class_order t1
left join class_order_refund t2 on t1.orderdate>t2.orderdate

It can be rewritten as

select ... from
class_order t1
left join class_order_refund t2
where t1.orderdate>t2.orderdate

2, if the first method is not applicable, based on the select field

select
...
if(t1.orderdate>t2.orderdate,0,1) as is_refund
...
from
class_order t1
left join class_order_refund t2 on t1.orderdate>t2.orderdate

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