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https://issues.apache.org/jira/browse/HIVE-3432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13448797#comment-13448797
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Namit Jain commented on HIVE-3432:
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Conditional Task selects one task or the other.
In case of map-joins, one local job reads the small table and fails/succeeds
quickly.
In this case, all the mappers will have to be tried, and then we may fail after
a very long time.
Moreover, it would be very difficult to know, that the task has failed due to
memory overflow by the bucket.
> perform a map-only group by is grouping key matches the sorting properties of
> the table
> ---------------------------------------------------------------------------------------
>
> Key: HIVE-3432
> URL: https://issues.apache.org/jira/browse/HIVE-3432
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Sambavi Muthukrishnan
>
> There should be an option to use bucketizedinputformat and use map-only group
> by. There would be no need to perform a map-side aggregation.
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