DROP TABLE IF EXISTS lineitem;
DROP TABLE IF EXISTS orders;
DROP TABLE IF EXISTS customer;
DROP TABLE IF EXISTS nation;
DROP TABLE IF EXISTS q10_returned_item;

-- create the tables and load the data
Create external table lineitem (L_ORDERKEY INT, L_PARTKEY INT, L_SUPPKEY INT, L_LINENUMBER INT, L_QUANTITY DOUBLE, L_EXTENDEDPRICE DOUBLE, L_DISCOUNT DOUBLE, L_TAX DOUBLE, L_RETURNFLAG STRING, L_LINESTATUS STRING, L_SHIPDATE STRING, L_COMMITDATE STRING, L_RECEIPTDATE STRING, L_SHIPINSTRUCT STRING, L_SHIPMODE STRING, L_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/lineitem';
create external table orders (O_ORDERKEY INT, O_CUSTKEY INT, O_ORDERSTATUS STRING, O_TOTALPRICE DOUBLE, O_ORDERDATE STRING, O_ORDERPRIORITY STRING, O_CLERK STRING, O_SHIPPRIORITY INT, O_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/orders';
create external table customer (C_CUSTKEY INT, C_NAME STRING, C_ADDRESS STRING, C_NATIONKEY INT, C_PHONE STRING, C_ACCTBAL DOUBLE, C_MKTSEGMENT STRING, C_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/customer';
create external table nation (N_NATIONKEY INT, N_NAME STRING, N_REGIONKEY INT, N_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/nation';

-- create the result table
create table q10_returned_item (c_custkey int, c_name string, revenue double, c_acctbal string, n_name string, c_address string, c_phone string, c_comment string);

set mapred.min.split.size=536870912;
set hive.exec.reducers.bytes.per.reducer=1024000000;

-- the query
insert overwrite table q10_returned_item
select 
  c_custkey, c_name, sum(l_extendedprice * (1 - l_discount)) as revenue, 
  c_acctbal, n_name, c_address, c_phone, c_comment
from
  customer c join orders o 
  on 
    c.c_custkey = o.o_custkey and o.o_orderdate >= '1993-10-01' and o.o_orderdate < '1994-01-01'
  join nation n 
  on 
    c.c_nationkey = n.n_nationkey
  join lineitem l 
  on 
    l.l_orderkey = o.o_orderkey and l.l_returnflag = 'R'
group by c_custkey, c_name, c_acctbal, c_phone, n_name, c_address, c_comment 
order by revenue desc 
limit 20;