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https://issues.apache.org/jira/browse/HIVE-1900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990673#comment-12990673
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Namit Jain commented on HIVE-1900:
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https://reviews.apache.org/r/393/
> a mapper should be able to span multiple partitions
> ---------------------------------------------------
>
> Key: HIVE-1900
> URL: https://issues.apache.org/jira/browse/HIVE-1900
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
> Attachments: hive.1900.1.patch
>
>
> Currently, a mapper only spans a single partition which creates a problem in
> the presence of many
> small partitions (which is becoming a common usecase in facebook).
> If the plan is the same, a mapper should be able to span files across
> multiple partitions
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