Namit Jain created HIVE-3633:
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Summary: sort-merge join does not work with sub-queries
Key: HIVE-3633
URL: https://issues.apache.org/jira/browse/HIVE-3633
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Namit Jain
Consider the following query:
create table smb_bucket_1(key int, value string) CLUSTERED BY (key) SORTED BY
(key) INTO 6 BUCKETS STORED AS TEXTFILE;
create table smb_bucket_2(key int, value string) CLUSTERED BY (key) SORTED BY
(key) INTO 6 BUCKETS STORED AS TEXTFILE;
-- load the above tables
set hive.optimize.bucketmapjoin = true;
set hive.optimize.bucketmapjoin.sortedmerge = true;
set hive.input.format = org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
explain
select count(*) from
(
select /*+mapjoin(a)*/ a.key as key1, b.key as key2, a.value as value1, b.value
as value2
from smb_bucket_1 a join smb_bucket_2 b on a.key = b.key)
subq;
The above query does not use sort-merge join. This would be very useful as we
automatically convert the queries to use sorting and bucketing properties for
join.
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