set hive.mapred.supports.subdirectories=true;
set hive.exec.dynamic.partition=true;
set hive.exec.dynamic.partition.mode=nonstrict;
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;

-- INCLUDE_HADOOP_MAJOR_VERSIONS(0.23)
-- SORT_QUERY_RESULTS
-- JAVA_VERSION_SPECIFIC_OUTPUT

-- 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 (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 partition (ds = '2008-04-08',  hr = '11')
select key, value from srcpart where ds = '2008-04-08';

insert overwrite table list_bucketing_static_part 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;
desc formatted list_bucketing_static_part 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 partition (ds = '2008-04-08',  hr = '11')
select key, value from srcpart where ds = '2008-04-08';

insert overwrite table list_bucketing_static_part 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;
desc formatted list_bucketing_static_part partition (ds='2008-04-08', hr='11');	

select count(1) from srcpart where ds = '2008-04-08';
select count(*) from list_bucketing_static_part;

set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat;
set hive.optimize.listbucketing=true;
explain extended
select * from list_bucketing_static_part where ds = '2008-04-08' and  hr = '11' and key = '484' and value = 'val_484';
select * from list_bucketing_static_part 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;