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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-4240) optimize hive.enforce.bucketing and hive.enforce sorting insert
Date Thu, 28 Mar 2013 04:43:14 GMT
Namit Jain created HIVE-4240:
--------------------------------

             Summary: 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: Bug
          Components: Query Processor
            Reporter: Namit Jain
            Assignee: Namit Jain


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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