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https://issues.apache.org/jira/browse/HIVE-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13596381#comment-13596381
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Ashutosh Chauhan commented on HIVE-4042:
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For the first query you have, my understanding is with this patch (which
removes map-join hints), this will result in two regular Joins which will both
get converted to map-join (if they satisfy requirements). Problem is this still
results in 2 Map-only jobs, instead it should have resulted in 1 Map-only job
with both joins happening in same mapper. Prior to HIVE-3784 i.e., on 0.10,
above query would result in 1 MR job.
So, to get back the desired behavior of 0.10, {{
hive.auto.convert.join.noconditionaltask}} needs to be true.
> 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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