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Question

我试图总结Hive中2个内部查询的计数，但这会引发错误“UDAF计数尚未支持的位置”。任何建议都会很棒

SELECT sum(count(distinct session),count(distinct session1)) FROM (
select concat(high, low, visit_num) as session from tab1
union all
select concat(high, low, visit_num) as session1 from tab2)t;

Answer 1

SELECT sum(cnt) 
FROM 
(
  select count(distinct concat(high, low, visit_num)) as cnt from tab1
  union all
  select count(distinct concat(high, low, visit_num)) as cnt from tab2
) t