Hive：无法执行带限制的联合查询

Question

我正在尝试 运行 在配置单元中合并所有查询

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'

我也试过了

( 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;

但是我得到了

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

我做错了什么？

Answer 1

使用子查询中的 select:

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;