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https://issues.apache.org/jira/browse/HIVE-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namit Jain updated HIVE-3892:
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Status: Patch Available (was: Open)
> 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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