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https://issues.apache.org/jira/browse/HIVE-15655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15839522#comment-15839522
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Lefty Leverenz commented on HIVE-15655:
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Thanks for the detailed doc, Gopal.
* [hive.merge.nway.joins |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.merge.nway.joins]
> Optimizer: Allow config option to disable n-way JOIN merging
> -------------------------------------------------------------
>
> Key: HIVE-15655
> URL: https://issues.apache.org/jira/browse/HIVE-15655
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Affects Versions: 2.2.0
> Reporter: Gopal V
> Assignee: Gopal V
> Fix For: 2.2.0
>
> Attachments: HIVE-15655.1.patch, HIVE-15655.2.patch,
> HIVE-15655.2.patch, HIVE-15655.3.patch
>
>
> N-way Joins in Tez produce bad runtime plans whenever they are left-outer
> joins with map-joins.
> This is something which should have a safety setting.
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