| --! qt:dataset:part |
| set hive.strict.checks.bucketing=false; |
| |
| set hive.mapred.mode=nonstrict; |
| -- small 2 part, 2 bucket & big 1 part, 4 bucket |
| CREATE TABLE bucket_small_n9 (key string, value string) partitioned by (ds string) CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS STORED AS TEXTFILE |
| TBLPROPERTIES('bucketing_version'='1'); |
| load data local inpath '../../data/files/auto_sortmerge_join/small/000000_0' INTO TABLE bucket_small_n9 partition(ds='2008-04-08'); |
| load data local inpath '../../data/files/auto_sortmerge_join/small/000001_0' INTO TABLE bucket_small_n9 partition(ds='2008-04-08'); |
| |
| load data local inpath '../../data/files/auto_sortmerge_join/small/000000_0' INTO TABLE bucket_small_n9 partition(ds='2008-04-09'); |
| load data local inpath '../../data/files/auto_sortmerge_join/small/000001_0' INTO TABLE bucket_small_n9 partition(ds='2008-04-09'); |
| |
| CREATE TABLE bucket_big_n9 (key string, value string) partitioned by (ds string) CLUSTERED BY (key) SORTED BY (key) INTO 4 BUCKETS STORED AS TEXTFILE |
| TBLPROPERTIES('bucketing_version'='1'); |
| load data local inpath '../../data/files/auto_sortmerge_join/big/000000_0' INTO TABLE bucket_big_n9 partition(ds='2008-04-08'); |
| load data local inpath '../../data/files/auto_sortmerge_join/big/000001_0' INTO TABLE bucket_big_n9 partition(ds='2008-04-08'); |
| load data local inpath '../../data/files/auto_sortmerge_join/big/000002_0' INTO TABLE bucket_big_n9 partition(ds='2008-04-08'); |
| load data local inpath '../../data/files/auto_sortmerge_join/big/000003_0' INTO TABLE bucket_big_n9 partition(ds='2008-04-08'); |
| |
| set hive.auto.convert.join=true; |
| set hive.auto.convert.sortmerge.join=true; |
| set hive.optimize.bucketmapjoin = true; |
| set hive.optimize.bucketmapjoin.sortedmerge = true; |
| set hive.auto.convert.sortmerge.join.to.mapjoin=false; |
| set hive.auto.convert.sortmerge.join.bigtable.selection.policy = org.apache.hadoop.hive.ql.optimizer.TableSizeBasedBigTableSelectorForAutoSMJ; |
| -- disable hash joins |
| set hive.auto.convert.join.noconditionaltask.size=100; |
| |
| -- Since size is being used to find the big table, the order of the tables in the join does not matter |
| explain extended select count(*) FROM bucket_small_n9 a JOIN bucket_big_n9 b ON a.key = b.key; |
| select count(*) FROM bucket_small_n9 a JOIN bucket_big_n9 b ON a.key = b.key; |
| |
| explain extended select count(*) FROM bucket_big_n9 a JOIN bucket_small_n9 b ON a.key = b.key; |
| select count(*) FROM bucket_big_n9 a JOIN bucket_small_n9 b ON a.key = b.key; |
| |
| set hive.auto.convert.sortmerge.join.to.mapjoin=true; |
| explain extended select count(*) FROM bucket_big_n9 a JOIN bucket_small_n9 b ON a.key = b.key; |
| select count(*) FROM bucket_big_n9 a JOIN bucket_small_n9 b ON a.key = b.key; |