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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3171) Bucketed sort merge join doesn't work when multiple files exist for small alias
Date Fri, 24 Aug 2012 02:30:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440886#comment-13440886
] 

Navis commented on HIVE-3171:
-----------------------------

@Carl: I've not yet received account for ASF, and is it ok to commit by myself? (I thought
that the author and the committer should be different)
                
> 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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