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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2016/07/16 00:09:20 UTC

[jira] [Created] (HIVE-14256) CBO: Rewrite aggregate + distinct as 3-stage DAG

Gopal V created HIVE-14256:
------------------------------

             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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