Gopal V created HIVE-14256:
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Summary: CBO: Rewrite aggregate + distinct as 3-stage DAG
Key: HIVE-14256
URL: https://issues.apache.org/jira/browse/HIVE-14256
Project: Hive
Issue Type: Improvement
Components: CBO
Affects Versions: 2.2.0
Reporter: Gopal V
{code}
select sum(ss_net_profit), count(distinct ss_customer_sk) from store_sales;
{code}
is very slow, while manually sub-aggregating this makes it much faster.
{code}
select sum(v), count(c) from
( select sum(ss_net_profit) as v, ss_customer_sk as k from store_sales group by
ss_customer_sk);
{code}
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