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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2013/03/28 05:43:14 UTC
[jira] [Created] (HIVE-4240) optimize hive.enforce.bucketing and
hive.enforce sorting insert
Namit Jain created HIVE-4240:
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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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