[jira] [Commented] (HIVE-4042) ignore mapjoin hint

["Ashutosh Chauhan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591622#comment-13591622 ] 

Ashutosh Chauhan commented on HIVE-4042:
----------------------------------------

I think we should get HIVE-3891 in asap (I am reviewing it) and than either always ignore the mapjoin hint or not (depending on this new config). I don't like the idea of not ignoring it for bucketed/sorted join case. I think it will be burdensome for user to reason about whether to enable this config, hint will be ignored in some cases but not all. Than they will ask which are those cases and why. To avoid all this unnecessary explanation, just let either always ignore or never.
Also, you can set the value of this config to false in data/conf/hive-site.xml which is used for tests, so that patch need not to  update test outputs.
                
> ignore mapjoin hint
> -------------------
>
>                 Key: HIVE-4042
>                 URL: https://issues.apache.org/jira/browse/HIVE-4042
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>         Attachments: hive.4042.1.patch, hive.4042.2.patch, hive.4042.3.patch, hive.4042.4.patch, hive.4042.5.patch, hive.4042.6.patch, hive.4042.7.patch, hive.4042.8.patch
>
>
> After HIVE-3784, in a production environment, it can become difficult to
> deploy since a lot of production queries can break.

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