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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10568) Select count(distinct()) can have more optimal execution plan
Date Thu, 07 May 2015 15:31:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532861#comment-14532861
] 

Hive QA commented on HIVE-10568:
--------------------------------



{color:green}Overall{color}: +1 all checks pass

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12730747/HIVE-10568.1.patch

{color:green}SUCCESS:{color} +1 8912 tests passed

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/3798/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/3798/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-3798/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12730747 - PreCommit-HIVE-TRUNK-Build

> Select count(distinct()) can have more optimal execution plan
> -------------------------------------------------------------
>
>                 Key: HIVE-10568
>                 URL: https://issues.apache.org/jira/browse/HIVE-10568
>             Project: Hive
>          Issue Type: Improvement
>          Components: CBO, Logical Optimizer
>    Affects Versions: 0.6.0, 0.7.0, 0.8.0, 0.9.0, 0.10.0, 0.11.0, 0.12.0, 0.13.0, 0.14.0,
1.0.0, 1.1.0
>            Reporter: Mostafa Mokhtar
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-10568.1.patch, HIVE-10568.patch, HIVE-10568.patch
>
>
> {code:sql}
> select count(distinct ss_ticket_number) from store_sales;
> {code}
> can be rewritten as
> {code:sql}
> select count(1) from (select distinct ss_ticket_number from store_sales) a;
> {code}
> which may run upto 3x faster



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