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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20393) Semijoin Reduction : markSemiJoinForDPP behaves inconsistently
Date Thu, 16 Aug 2018 07:32:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16582079#comment-16582079
] 

Hive QA commented on HIVE-20393:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12935765/HIVE-20393.2.patch

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:green}SUCCESS:{color} +1 due to 14878 tests passed

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/13258/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/13258/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-13258/

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: 12935765 - PreCommit-HIVE-Build

> Semijoin Reduction : markSemiJoinForDPP behaves inconsistently
> --------------------------------------------------------------
>
>                 Key: HIVE-20393
>                 URL: https://issues.apache.org/jira/browse/HIVE-20393
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>         Attachments: HIVE-20393.1.patch, HIVE-20393.2.patch
>
>
> markSemiJoinForDPP has multiple issues,
>  
>  * Uses map tsOps which is wrong as it disallows going thru same TS which may have filters
from more than 1 semijoin edges. This results in inconsistent plans for same query as semijoin
edges may be processed in different order each time.
>  * Uses getColumnExpr() which is not as robust as extractColumn() thus resulting in NPEs.
>  * The logic to mark an edge useful when NPE is hit may end up having bad edge.
> cc [~gopalv]



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