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https://issues.apache.org/jira/browse/HIVE-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440920#comment-13440920
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Namit Jain commented on HIVE-3171:
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@Carl, @Navis, we mostly don't commit our patches. There have been a few
exceptions, but I think
we should try to stick to this policy: dont commit our own patches.
Also, can you hold off for a few hours - I wanted to take a pass at this patch.
Should be done today itself.
> Bucketed sort merge join doesn't work when multiple files exist for small
> alias
> -------------------------------------------------------------------------------
>
> Key: HIVE-3171
> URL: https://issues.apache.org/jira/browse/HIVE-3171
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.10.0
> Reporter: Joey Echeverria
> Assignee: Navis
> Labels: bucketing, joins, partitioning
> Attachments: HIVE-3171.1.patch.txt
>
>
> Executing a query with the MAPJOIN hint and the bucketed sort merge join
> optimizations enabled:
> {noformat}
> set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> {noformat}
> works fine with partitioned tables if there is only one partition in the
> table. However, if you add a second partition, Hive attempts to do a regular
> map-side join which can fail because the tables are too large. Hive ought to
> be able to still do the bucketed sort merge join with partitions.
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