Namit Jain created HIVE-3289:
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Summary: sort merge join may not work silently
Key: HIVE-3289
URL: https://issues.apache.org/jira/browse/HIVE-3289
Project: Hive
Issue Type: Bug
Reporter: Namit Jain
The user does not know, if the sort-merge join is working or not.
create table table_asc(key int, value string) CLUSTERED BY (key) SORTED BY (key
asc)
INTO 1 BUCKETS STORED AS RCFILE;
create table table_desc(key int, value string) CLUSTERED BY (key) SORTED BY
(key desc)
INTO 1 BUCKETS STORED AS RCFILE;
set hive.enforce.sorting = true;
insert overwrite table table_asc select key, value from src;
insert overwrite table table_desc select key, value from src;
set hive.optimize.bucketmapjoin = true;
set hive.optimize.bucketmapjoin.sortedmerge = true;
set hive.input.format = org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
explain
select /*+mapjoin(a)*/ * from table_asc a join table_desc b on a.key = b.key;
select /*+mapjoin(a)*/ * from table_asc a join table_desc b on a.key = b.key;
explain
select /*+mapjoin(b)*/ * from table_asc a join table_desc b on a.key = b.key;
select /*+mapjoin(b)*/ * from table_asc a join table_desc b on a.key = b.key;
In the above test, the sort-merge join is not obeyed as expected.
If you user explicitly asked for sort-merge join, and it is not being
obeyed, the operation should fail.
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