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https://issues.apache.org/jira/browse/HIVE-4167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629948#comment-13629948
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Namit Jain commented on HIVE-4167:
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I was able to reproduce it:
CREATE TABLE bucket_small (key string, value string) partitioned by (ds string)
CLUSTERED BY (key) INTO 2 BUCKETS STORED AS TEXTFILE;
load data local inpath '../data/files/smallsrcsortbucket1outof4.txt' INTO TABLE
bucket_small partition(ds='2008-04-08');
load data local inpath '../data/files/smallsrcsortbucket2outof4.txt' INTO TABLE
bucket_small partition(ds='2008-04-08');
CREATE TABLE bucket_big (key string, value string) partitioned by (ds string)
CLUSTERED BY (key) INTO 4 BUCKETS STORED AS TEXTFILE;
load data local inpath '../data/files/srcsortbucket1outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-08');
load data local inpath '../data/files/srcsortbucket2outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-08');
load data local inpath '../data/files/srcsortbucket3outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-08');
load data local inpath '../data/files/srcsortbucket4outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-08');
load data local inpath '../data/files/srcsortbucket1outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-09');
load data local inpath '../data/files/srcsortbucket2outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-09');
load data local inpath '../data/files/srcsortbucket3outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-09');
load data local inpath '../data/files/srcsortbucket4outof4.txt' INTO TABLE
bucket_big partition(ds='2008-04-09');
set hive.auto.convert.join=true;
set hive.auto.convert.sortmerge.join=true;
set hive.optimize.bucketmapjoin = true;
set hive.optimize.bucketmapjoin.sortedmerge = true;
-- Since size is being used to find the big table, the order of the tables in
the join does not matter
explain extended select count(*) FROM bucket_small a JOIN bucket_big b ON a.key
= b.key;
select count(*) FROM bucket_small a JOIN bucket_big b ON a.key = b.key;
explain extended select count(*) FROM bucket_big a JOIN bucket_small b ON a.key
= b.key;
select count(*) FROM bucket_big a JOIN bucket_small b ON a.key = b.key;
> Hive converts bucket map join to SMB join even when tables are not sorted
> -------------------------------------------------------------------------
>
> Key: HIVE-4167
> URL: https://issues.apache.org/jira/browse/HIVE-4167
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: Vikram Dixit K
> Assignee: Namit Jain
> Priority: Blocker
> Attachments: HIVE-4167.patch
>
>
> If tables are just bucketed but not sorted, we are generating smb join
> operator. This results in loss of rows in queries.
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