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https://issues.apache.org/jira/browse/HIVE-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585006#comment-13585006
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Namit Jain commented on HIVE-4042:
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I agree - that is fairly difficult to find out at the semantic analysis time
before any pruning.
The hint is to help deployments where there are a lot of queries running with
mapjoin hint, and so they will fail.
I can add logging while the hint is being ignored, it leaves the burden on the
client to change the query.
> 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
>
>
> 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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