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