Pengcheng Xiong created HIVE-16654:
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Summary: Optimize a combination of avg(), sum(), count(distinct)
etc
Key: HIVE-16654
URL: https://issues.apache.org/jira/browse/HIVE-16654
Project: Hive
Issue Type: Bug
Reporter: Pengcheng Xiong
Assignee: Pengcheng Xiong
an example rewrite for q28 of tpcds is
{code}
(select LP as B1_LP ,CNT as B1_CNT,CNTD as B1_CNTD
from (select sum(xc0) / sum(xc1) as LP, sum(xc1) as CNT, count(1) as CNTD
from (select sum(ss_list_price) as xc0, count(ss_list_price) as xc1 from
store_sales where
ss_list_price is not null and ss_quantity between 0 and 5
and (ss_list_price between 11 and 11+10
or ss_coupon_amt between 460 and 460+1000
or ss_wholesale_cost between 14 and 14+20)
group by ss_list_price) ss0) ss1) B1
{code}
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