[
https://issues.apache.org/jira/browse/HIVE-14256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ashutosh Chauhan resolved HIVE-14256.
-------------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
> 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
> Priority: Major
> Fix For: 2.3.0
>
>
> {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}
> Query28 in TPC-DS would be an example of whether this would be valuable.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
