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From "Gang Tim Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4240) optimize hive.enforce.bucketing and hive.enforce sorting insert
Date Wed, 03 Apr 2013 04:45:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620604#comment-13620604
] 

Gang Tim Liu commented on HIVE-4240:
------------------------------------

+1
                
> optimize hive.enforce.bucketing and hive.enforce sorting insert
> ---------------------------------------------------------------
>
>                 Key: HIVE-4240
>                 URL: https://issues.apache.org/jira/browse/HIVE-4240
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>         Attachments: hive.4240.1.patch, hive.4240.2.patch, hive.4240.3.patch, hive.4240.4.patch,
hive.4240.5.patch
>
>
> Consider the following scenario:
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> set hive.input.format = org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
> set hive.enforce.bucketing=true;
> set hive.enforce.sorting=true;
> set hive.exec.reducers.max = 1;
> set hive.merge.mapfiles=false;
> set hive.merge.mapredfiles=false;
> -- Create two bucketed and sorted tables
> CREATE TABLE test_table1 (key INT, value STRING) PARTITIONED BY (ds STRING) CLUSTERED
BY (key) SORTED BY (key) INTO 2 BUCKETS;
> CREATE TABLE test_table2 (key INT, value STRING) PARTITIONED BY (ds STRING) CLUSTERED
BY (key) SORTED BY (key) INTO 2 BUCKETS;
> FROM src
> INSERT OVERWRITE TABLE test_table1 PARTITION (ds = '1') SELECT *;
> -- Insert data into the bucketed table by selecting from another bucketed table
> -- This should be a map-only operation
> INSERT OVERWRITE TABLE test_table2 PARTITION (ds = '1')
> SELECT a.key, a.value FROM test_table1 a WHERE a.ds = '1';
> We should not need a reducer to perform the above operation.

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