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https://issues.apache.org/jira/browse/HIVE-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13450762#comment-13450762
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Namit Jain commented on HIVE-3171:
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@Carl, let me know if you are busy.
I also ran the tests, and they ran fine.
I can commit it.
I need this patch for some other jiras, and the sooner I get it in, the easier
it is for me.
> 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, HIVE-3171.2.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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