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https://issues.apache.org/jira/browse/HIVE-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Navis updated HIVE-3171:
------------------------
Affects Version/s: 0.10.0
Summary: Bucketed sort merge join doesn't work when multiple
files exist for small alias (was: Bucketed sort merge join doesn't work on
tables with more than one partition)
Small aliases can have multiple partitions or can have more buckets than
driving alias or both.
> 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
>
> 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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