Namit Jain created HIVE-3892:
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Summary: auto sort merge join does not work for sub-queries
Key: HIVE-3892
URL: https://issues.apache.org/jira/browse/HIVE-3892
Project: Hive
Issue Type: Bug
Components: Query Processor
Reporter: Namit Jain
Assignee: Namit Jain
set hive.enforce.bucketing = true;
set hive.enforce.sorting = true;
set hive.exec.reducers.max = 1;
CREATE TABLE tbl1(key int, value string) CLUSTERED BY (key) SORTED BY (key)
INTO 2 BUCKETS;
CREATE TABLE tbl2(key int, value string) CLUSTERED BY (key) SORTED BY (key)
INTO 2 BUCKETS;
insert overwrite table tbl1
select * from src where key < 10;
insert overwrite table tbl2
select * from src where key < 10;
set hive.auto.sort.merge.join=true;
set hive.optimize.bucketmapjoin = true;
set hive.optimize.bucketmapjoin.sortedmerge = true;
set hive.auto.sort.merge.join.bigtbl.matcher =
org.apache.hadoop.hive.ql.optimizer.SizeSortMergeJoinBigTableMatcher;
-- The join is being performed in sub-query. It should be converted to a
sort-merge join
explain
select count(*) from (
select a.key as key, a.value as val1, b.value as val2 from tbl1 a join tbl2 b
on a.key = b.key
) subq1;
Even after HIVE-3403, the test above does not convert to a sort-merge join.
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