| --! qt:dataset:srcpart |
| set hive.mapred.mode=nonstrict; |
| set hive.exec.dynamic.partition=true; |
| set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat; |
| set hive.merge.smallfiles.avgsize=200; |
| set mapred.input.dir.recursive=true; |
| set hive.merge.mapfiles=false; |
| set hive.merge.mapredfiles=false; |
| |
| -- SORT_QUERY_RESULTS |
| |
| -- list bucketing DML: static partition. multiple skewed columns. merge. |
| -- ds=2008-04-08/hr=11/HIVE_DEFAULT_LIST_BUCKETING_DIR_NAME: |
| -- 5263 000000_0 |
| -- 5263 000001_0 |
| -- ds=2008-04-08/hr=11/key=103: |
| -- 99 000000_0 |
| -- 99 000001_0 |
| -- after merge |
| -- 142 000000_0 |
| -- ds=2008-04-08/hr=11/key=484: |
| -- 87 000000_0 |
| -- 87 000001_0 |
| -- after merge |
| -- 118 000001_0 |
| |
| -- create a skewed table |
| create table list_bucketing_static_part_n0 (key String, value String) |
| partitioned by (ds String, hr String) |
| skewed by (key) on ('484','103') |
| stored as DIRECTORIES |
| STORED AS RCFILE; |
| |
| -- list bucketing DML without merge. use bucketize to generate a few small files. |
| explain extended |
| insert overwrite table list_bucketing_static_part_n0 partition (ds = '2008-04-08', hr = '11') |
| select key, value from srcpart where ds = '2008-04-08'; |
| |
| insert overwrite table list_bucketing_static_part_n0 partition (ds = '2008-04-08', hr = '11') |
| select key, value from srcpart where ds = '2008-04-08'; |
| |
| -- check DML result |
| show partitions list_bucketing_static_part_n0; |
| desc formatted list_bucketing_static_part_n0 partition (ds='2008-04-08', hr='11'); |
| |
| set hive.merge.mapfiles=true; |
| set hive.merge.mapredfiles=true; |
| -- list bucketing DML with merge. use bucketize to generate a few small files. |
| explain extended |
| insert overwrite table list_bucketing_static_part_n0 partition (ds = '2008-04-08', hr = '11') |
| select key, value from srcpart where ds = '2008-04-08'; |
| |
| insert overwrite table list_bucketing_static_part_n0 partition (ds = '2008-04-08', hr = '11') |
| select key, value from srcpart where ds = '2008-04-08'; |
| |
| -- check DML result |
| show partitions list_bucketing_static_part_n0; |
| desc formatted list_bucketing_static_part_n0 partition (ds='2008-04-08', hr='11'); |
| |
| select count(1) from srcpart where ds = '2008-04-08'; |
| select count(*) from list_bucketing_static_part_n0; |
| |
| set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat; |
| set hive.optimize.listbucketing=true; |
| explain extended |
| select * from list_bucketing_static_part_n0 where ds = '2008-04-08' and hr = '11' and key = '484' and value = 'val_484'; |
| select * from list_bucketing_static_part_n0 where ds = '2008-04-08' and hr = '11' and key = '484' and value = 'val_484'; |
| select * from srcpart where ds = '2008-04-08' and key = '484' and value = 'val_484'; |
| |
| -- clean up |
| drop table list_bucketing_static_part_n0; |