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From "Hive QA (JIRA)" <>
Subject [jira] [Commented] (HIVE-20393) Semijoin Reduction : markSemiJoinForDPP behaves inconsistently
Date Wed, 15 Aug 2018 19:42:00 GMT


Hive QA commented on HIVE-20393:

Here are the results of testing the latest attachment:

{color:red}ERROR:{color} -1 due to build exiting with an error

Test results:
Console output:
Test logs:

Executing org.apache.hive.ptest.execution.TestCheckPhase
Tests exited with: Exception: Patch URL
was found in seen patch url's cache and a test was probably run already on it. Aborting...

This message is automatically generated.

ATTACHMENT ID: 12935661 - PreCommit-HIVE-Build

> Semijoin Reduction : markSemiJoinForDPP behaves inconsistently
> --------------------------------------------------------------
>                 Key: HIVE-20393
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>         Attachments: HIVE-20393.1.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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