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https://issues.apache.org/jira/browse/HIVE-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433923#comment-13433923
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Namit Jain commented on HIVE-1249:
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duplicate of HIVE-3375
> MapJoin to Check Number of Files to Match Metadata
> --------------------------------------------------
>
> Key: HIVE-1249
> URL: https://issues.apache.org/jira/browse/HIVE-1249
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Siying Dong
> Assignee: Namit Jain
> Priority: Minor
>
> Sorted Map Join only can execute when two tables' bucket numbers are the same.
> Currently, the checking is done by looking at metadata of the table. However,
> for some reason, the real physical storage is not guaranteed to follow what
> the metadata indicates. In that case, Sorted Map Join might fail to identify
> it and deliver wrong results. An extra check when storage scan is necessary
> to deal with the scenario.
> This issue may also apply to normal map join.
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