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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11605) Incorrect results with bucket map join in tez.
Date Thu, 20 Aug 2015 03:57:46 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14704257#comment-14704257
] 

Gopal V commented on HIVE-11605:
--------------------------------

The fixed hashCode fix is critical. LGTM - +1.

[~vikram.dixit]: I've written a small program that generates a near infinite number of test-cases
for bucket map-joins to find out if the right cases are triggered.

https://gist.github.com/t3rmin4t0r/3185edb18efa29188796

I've annotated each query with the optimal plan according to my algorithm (assuming all types
are identical).

> Incorrect results with bucket map join in tez.
> ----------------------------------------------
>
>                 Key: HIVE-11605
>                 URL: https://issues.apache.org/jira/browse/HIVE-11605
>             Project: Hive
>          Issue Type: Bug
>          Components: Tez
>    Affects Versions: 1.0.0, 1.2.0, 1.0.1
>            Reporter: Vikram Dixit K
>            Assignee: Vikram Dixit K
>            Priority: Critical
>         Attachments: HIVE-11605.1.patch
>
>
> In some cases, we aggressively try to convert to a bucket map join and this ends up producing
incorrect results.



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