Hive：无法执行有限制的联合查询

Question

我正在尝试在 hive 中运行 union all 查询

select * from tabName where col1='val1' and col2 = 'val2' limit 10 union all select * from tabName where col1='val1' and col2 = 'val3' limit 10;

但我明白了

FAILED: ParseException line 1:105 missing EOF at 'union' near '10'

我也试过

( select * from tabName where col1='val1' and col2 = 'val2' limit 10 ) as a union all ( select * from tabName where col1='val1' and col2 = 'val3' limit 10 ) as b;

但我得到了

FAILED: ParseException line 1:109 missing EOF at 'as' near ')'

我究竟做错了什么 ？

Answer 1

使用从子查询中选择：

select * from
( select * from tabName where col1='val1' and col2 = 'val2' limit 10 ) a 
union all 
select * from
( select * from tabName where col1='val1' and col2 = 'val3' limit 10 ) b;