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https://issues.apache.org/jira/browse/HIVE-4997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256965#comment-15256965
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Sushanth Sowmyan commented on HIVE-4997:
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Using Hive tables directly through mapreduce - HCat is the primary way to do
it. As for reading multiple tables simultaneously through HCat, to do your own
custom join, HCat does not support that feature yet, but from the activity on
this jira, is clearly a capability people want.
> HCatalog doesn't allow multiple input tables
> --------------------------------------------
>
> Key: HIVE-4997
> URL: https://issues.apache.org/jira/browse/HIVE-4997
> Project: Hive
> Issue Type: Improvement
> Components: HCatalog
> Affects Versions: 0.13.0
> Reporter: Daniel Intskirveli
> Attachments: HIVE-4997.2.patch, HIVE-4997.3.patch, HIVE-4997.4.patch
>
>
> HCatInputFormat does not allow reading from multiple hive tables in the same
> MapReduce job.
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