Hive 的collect_set使用详解
Hive 的collect_set使用详解
select a,collect_set(b) as bb from t where b<='xxxxxx' group by a
a1,["b1","b2"]
a2,["b1","b2","b3","b4"]
可以按照这个返回的数组做文章,即为
select * from (select a,collect_set(b) as bb from t where b<='xxxxxx' group by a
) where size(tmp.bb)=1 and
tmp
.bb[0]='xxxxxxxx';
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