[jira] [Commented] (HIVE-16654) Optimize a combination of avg(), sum(), count(distinct) etc

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-16654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16036185#comment-16036185 ] 

Lefty Leverenz commented on HIVE-16654:
---------------------------------------

Doc note:  This adds *hive.optimize.countdistinct* to HiveConf.java, so it needs to be documented in the wiki.

* [Configuration Properties -- Query and DDL Execution | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]

Added a TODOC3.0 label.

> 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
>    Affects Versions: 2.0.0
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>              Labels: TODOC3.0
>             Fix For: 3.0.0
>
>         Attachments: HIVE-16654.01.patch, HIVE-16654.02.patch, HIVE-16654.03.patch, HIVE-16654.04.patch
>
>
> 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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