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Date: Fri, 9 Nov 2012 11:40:12 +0000 (UTC)
From: "Namit Jain (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Updated] (HIVE-3633) sort-merge join does not work with
 sub-queries
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     [ https://issues.apache.org/jira/browse/HIVE-3633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Namit Jain updated HIVE-3633:
-----------------------------

    Attachment: hive.3633.1.patch
    
> sort-merge join does not work with sub-queries
> ----------------------------------------------
>
>                 Key: HIVE-3633
>                 URL: https://issues.apache.org/jira/browse/HIVE-3633
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>         Attachments: hive.3633.1.patch
>
>
> Consider the following query:
> create table smb_bucket_1(key int, value string) CLUSTERED BY (key) SORTED BY (key) INTO 6 BUCKETS STORED AS TEXTFILE;
> create table smb_bucket_2(key int, value string) CLUSTERED BY (key) SORTED BY (key) INTO 6 BUCKETS STORED AS TEXTFILE;
> -- load the above tables
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> set hive.input.format = org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
> explain
> select count(*) from
> (
> select /*+mapjoin(a)*/ a.key as key1, b.key as key2, a.value as value1, b.value as value2
> from smb_bucket_1 a join smb_bucket_2 b on a.key = b.key)
> subq;
> The above query does not use sort-merge join. This would be very useful as we automatically convert the queries to use sorting and bucketing properties for join.

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