DROP TABLE IF EXISTS customer;
DROP TABLE IF EXISTS orders;
DROP TABLE IF EXISTS lineitem;
DROP TABLE IF EXISTS supplier;
DROP TABLE IF EXISTS nation;
DROP TABLE IF EXISTS q7_volume_shipping;
DROP TABLE IF EXISTS q7_volume_shipping_tmp;

-- create tables and load data
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 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 supplier (S_SUPPKEY INT, S_NAME STRING, S_ADDRESS STRING, S_NATIONKEY INT, S_PHONE STRING, S_ACCTBAL DOUBLE, S_COMMENT STRING) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|' STORED AS TEXTFILE LOCATION '/tpch/supplier';
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 target table
create table q7_volume_shipping (supp_nation string, cust_nation string, l_year int, revenue double);
create table q7_volume_shipping_tmp(supp_nation string, cust_nation string, s_nationkey int, c_nationkey int);

set mapred.min.split.size=536870912;
set hive.exec.reducers.bytes.per.reducer=1225000000;

-- the query
insert overwrite table q7_volume_shipping_tmp
select 
  * 
from
  (
    select 
      n1.n_name as supp_nation, n2.n_name as cust_nation, n1.n_nationkey as s_nationkey,      
      n2.n_nationkey as c_nationkey
from 
  nation n1 join nation n2 
  on 
    n2.n_name = 'GERMANY'
    UNION ALL
select 
  n1.n_name as supp_nation, n2.n_name as cust_nation, n1.n_nationkey as s_nationkey, 
  n2.n_nationkey as c_nationkey
from 
  nation n1 join nation n2 
  on 
    n1.n_name = 'GERMANY'
) a;

insert overwrite table q7_volume_shipping 
select 
  supp_nation, cust_nation, l_year, sum(volume) as revenue
from 
  (
    select
      supp_nation, cust_nation, year(l_shipdate) as l_year, 
      l_extendedprice * (1 - l_discount) as volume
    from
      q7_volume_shipping_tmp t join
        (select l_shipdate, l_extendedprice, l_discount, c_nationkey, s_nationkey 
         from supplier s join
           (select l_shipdate, l_extendedprice, l_discount, l_suppkey, c_nationkey 
            from customer c join
              (select l_shipdate, l_extendedprice, l_discount, l_suppkey, o_custkey 
               from orders o join lineitem l 
               on 
                 o.o_orderkey = l.l_orderkey and l.l_shipdate >= '1992-01-01' 
                 and l.l_shipdate <= '1996-12-31'
               ) l1 on c.c_custkey = l1.o_custkey
            ) l2 on s.s_suppkey = l2.l_suppkey
         ) l3 on l3.c_nationkey = t.c_nationkey and l3.s_nationkey = t.s_nationkey
   ) shipping
group by supp_nation, cust_nation, l_year
order by supp_nation, cust_nation, l_year;