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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-19684) Hive stats optimizer wrongly uses stats against non native tables
Date Sat, 26 May 2018 08:58:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-19684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16491582#comment-16491582
] 

Hive QA commented on HIVE-19684:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12925223/HIVE-19684.3.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:green}SUCCESS:{color} +1 due to 14393 tests passed

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/11224/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/11224/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-11224/

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

This message is automatically generated.

ATTACHMENT ID: 12925223 - PreCommit-HIVE-Build

> Hive stats optimizer wrongly uses stats against non native tables
> -----------------------------------------------------------------
>
>                 Key: HIVE-19684
>                 URL: https://issues.apache.org/jira/browse/HIVE-19684
>             Project: Hive
>          Issue Type: Bug
>          Components: Druid integration, Physical Optimizer
>            Reporter: slim bouguerra
>            Assignee: slim bouguerra
>            Priority: Blocker
>         Attachments: HIVE-19684.2.patch, HIVE-19684.3.patch, HIVE-19684.patch
>
>
> Stats of non native tables are inaccurate, thus queries over non native tables can not
optimized by stats optimizer.
> Take example of query 
> {code}
> Explain select count(*) from (select `__time` from druid_test_table limit 1) as src ;
> {code} 
> the plan will be reduced to 
> {code}
> POSTHOOK: query: explain extended select count(*) from (select `__time` from druid_test_table
limit 1) as src
> POSTHOOK: type: QUERY
> STAGE DEPENDENCIES:
>   Stage-0 is a root stage
> STAGE PLANS:
>   Stage: Stage-0
>     Fetch Operator
>       limit: 1
>       Processor Tree:
>         ListSink
> {code}



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