| --! qt:dataset:src |
| set hive.mapred.mode=nonstrict; |
| set hive.explain.user=false; |
| ; |
| |
| set hive.exec.reducers.max = 1; |
| |
| CREATE TABLE tbl1_n11(key int, value string) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS; |
| CREATE TABLE tbl2_n10(key int, value string) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS; |
| |
| insert overwrite table tbl1_n11 select * from src where key < 20; |
| insert overwrite table tbl2_n10 select * from src where key < 10; |
| |
| set hive.merge.mapfiles=false; |
| set hive.merge.mapredfiles=false; |
| set hive.auto.convert.sortmerge.join.to.mapjoin=true; |
| set hive.auto.convert.sortmerge.join=true; |
| set hive.optimize.bucketmapjoin = true; |
| set hive.optimize.bucketmapjoin.sortedmerge = true; |
| set hive.auto.convert.join=true; |
| -- disable hash joins |
| set hive.auto.convert.join.noconditionaltask.size=10; |
| |
| explain |
| select count(*) FROM tbl1_n11 a LEFT OUTER JOIN tbl2_n10 b ON a.key = b.key; |
| |
| explain |
| select count(*) FROM tbl1_n11 a RIGHT OUTER JOIN tbl2_n10 b ON a.key = b.key; |
