| --! qt:dataset:src |
| set hive.optimize.bucketmapjoin = true; |
| set hive.optimize.bucketmapjoin.sortedmerge = true; |
| |
| |
| set hive.exec.reducers.max = 1; |
| set hive.merge.mapfiles=false; |
| set hive.merge.mapredfiles=false; |
| |
| -- Create two bucketed and sorted tables |
| CREATE TABLE test_table1_n7 (key INT, value STRING) PARTITIONED BY (ds STRING) |
| CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS; |
| CREATE TABLE test_table2_n7 (key INT, value STRING) PARTITIONED BY (ds STRING) |
| CLUSTERED BY (key) SORTED BY (key) INTO 2 BUCKETS; |
| |
| FROM src |
| INSERT OVERWRITE TABLE test_table1_n7 PARTITION (ds = '1') SELECT *; |
| |
| -- Insert data into the bucketed table by selecting from another bucketed table |
| -- This should be a map-only operation |
| EXPLAIN |
| INSERT OVERWRITE TABLE test_table2_n7 PARTITION (ds = '1') |
| SELECT a.key, a.value FROM test_table1_n7 a WHERE a.ds = '1'; |
| |
| INSERT OVERWRITE TABLE test_table2_n7 PARTITION (ds = '1') |
| SELECT a.key, a.value FROM test_table1_n7 a WHERE a.ds = '1'; |
| |
| select count(*) from test_table1_n7 where ds = '1'; |
| select count(*) from test_table1_n7 where ds = '1' and hash(key) % 2 = 0; |
| select count(*) from test_table1_n7 where ds = '1' and hash(key) % 2 = 1; |
| select count(*) from test_table1_n7 tablesample (bucket 1 out of 2) s where ds = '1'; |
| select count(*) from test_table1_n7 tablesample (bucket 2 out of 2) s where ds = '1'; |
| |
| select count(*) from test_table2_n7 where ds = '1'; |
| select count(*) from test_table2_n7 where ds = '1' and hash(key) % 2 = 0; |
| select count(*) from test_table2_n7 where ds = '1' and hash(key) % 2 = 1; |
| select count(*) from test_table2_n7 tablesample (bucket 1 out of 2) s where ds = '1'; |
| select count(*) from test_table2_n7 tablesample (bucket 2 out of 2) s where ds = '1'; |
| |
| set hive.optimize.constant.propagation=false; |
| -- Insert data into the bucketed table by selecting from another bucketed table |
| -- This should be a map-only operation, one of the buckets should be empty |
| |
| EXPLAIN |
| INSERT OVERWRITE TABLE test_table2_n7 PARTITION (ds = '2') |
| SELECT a.key, a.value FROM test_table1_n7 a WHERE a.ds = '1' and a.key = 238; |
| |
| INSERT OVERWRITE TABLE test_table2_n7 PARTITION (ds = '2') |
| SELECT a.key, a.value FROM test_table1_n7 a WHERE a.ds = '1' and a.key = 238; |
| |
| set hive.optimize.constant.propagation=true; |
| select count(*) from test_table2_n7 where ds = '2'; |
| select count(*) from test_table2_n7 where ds = '2' and hash(key) % 2 = 0; |
| select count(*) from test_table2_n7 where ds = '2' and hash(key) % 2 = 1; |
| select count(*) from test_table2_n7 tablesample (bucket 1 out of 2) s where ds = '2'; |
| select count(*) from test_table2_n7 tablesample (bucket 2 out of 2) s where ds = '2'; |
| |
| EXPLAIN |
| INSERT OVERWRITE TABLE test_table2_n7 PARTITION (ds = '3') |
| SELECT a.key, a.value FROM test_table2_n7 a WHERE a.ds = '2'; |
| |
| INSERT OVERWRITE TABLE test_table2_n7 PARTITION (ds = '2') |
| SELECT a.key, a.value FROM test_table2_n7 a WHERE a.ds = '2'; |
| |
| select count(*) from test_table2_n7 where ds = '3'; |
| select count(*) from test_table2_n7 where ds = '3' and hash(key) % 2 = 0; |
| select count(*) from test_table2_n7 where ds = '3' and hash(key) % 2 = 1; |
| select count(*) from test_table2_n7 tablesample (bucket 1 out of 2) s where ds = '3'; |
| select count(*) from test_table2_n7 tablesample (bucket 2 out of 2) s where ds = '3'; |