[jira] [Commented] (HIVE-4206) Sort merge join does not work for more than 7 inputs

["Namit Jain (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607830#comment-13607830 ] 

Namit Jain commented on HIVE-4206:
----------------------------------

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 bucketed and sorted tables
CREATE TABLE test_table1 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;
CREATE TABLE test_table2 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;
CREATE TABLE test_table3 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;
CREATE TABLE test_table4 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;
CREATE TABLE test_table5 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;
CREATE TABLE test_table6 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;
CREATE TABLE test_table7 (key INT, value STRING) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS;

FROM src
INSERT OVERWRITE TABLE test_table1 SELECT *;

FROM src
INSERT OVERWRITE TABLE test_table2 SELECT *;

FROM src
INSERT OVERWRITE TABLE test_table3 SELECT *;

FROM src
INSERT OVERWRITE TABLE test_table4 SELECT *;

FROM src
INSERT OVERWRITE TABLE test_table5 SELECT *;

FROM src
INSERT OVERWRITE TABLE test_table6 SELECT *;

FROM src
INSERT OVERWRITE TABLE test_table7 SELECT *;


-- Mapjoin followed by a aggregation should be performed in a single MR job
EXPLAIN
SELECT /*+mapjoin(b)*/ count(*) FROM test_table1 a JOIN test_table2 b ON a.key = b.key
JOIN test_table3 c ON a.key = c.key
JOIN test_table4 d ON a.key = d.key
JOIN test_table5 e ON a.key = e.key
JOIN test_table6 f ON a.key = f.key
JOIN test_table6 g ON a.key = g.key;


The above query does not use sort-merge join.
                
> Sort merge join does not work for more than 7 inputs
> ----------------------------------------------------
>
>                 Key: HIVE-4206
>                 URL: https://issues.apache.org/jira/browse/HIVE-4206
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>


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