-- create tables and load 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/100/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/100/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/100/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/100/nation';

-- create target tables
create table q21_tmp1(l_orderkey int, count_suppkey int, max_suppkey int);
create table q21_tmp2(l_orderkey int, count_suppkey int, max_suppkey int);
create table q21_suppliers_who_kept_orders_waiting(s_name string, numwait int);

-- the query
insert overwrite table q21_tmp1
select
  l_orderkey, count(distinct l_suppkey), max(l_suppkey) as max_suppkey
from
  lineitem
group by l_orderkey;

insert overwrite table q21_tmp2
select
  l_orderkey, count(distinct l_suppkey), max(l_suppkey) as max_suppkey
from
  lineitem
where
  l_receiptdate > l_commitdate
group by l_orderkey;

insert overwrite table q21_suppliers_who_kept_orders_waiting
select
  s_name, count(1) as numwait
from
  (select s_name from
(select s_name, t2.l_orderkey, l_suppkey, count_suppkey, max_suppkey 
 from q21_tmp2 t2 right outer join
      (select s_name, l_orderkey, l_suppkey from
         (select s_name, t1.l_orderkey, l_suppkey, count_suppkey, max_suppkey
          from
            q21_tmp1 t1 join
            (select s_name, l_orderkey, l_suppkey
             from 
               orders o join
               (select s_name, l_orderkey, l_suppkey
                from
                  nation n join supplier s
                  on
                    s.s_nationkey = n.n_nationkey
                    and n.n_name = 'SAUDI ARABIA'
                  join lineitem l
                  on
                    s.s_suppkey = l.l_suppkey
                where
                  l.l_receiptdate > l.l_commitdate
                ) l1 on o.o_orderkey = l1.l_orderkey and o.o_orderstatus = 'F'
             ) l2 on l2.l_orderkey = t1.l_orderkey
          ) a
          where
           (count_suppkey > 1) or ((count_suppkey=1) and (l_suppkey <> max_suppkey))
       ) l3 on l3.l_orderkey = t2.l_orderkey
    ) b
    where
     (count_suppkey is null) or ((count_suppkey=1) and (l_suppkey = max_suppkey))
  )c
group by s_name
order by numwait desc, s_name
limit 100;

DROP TABLE orders;
DROP TABLE lineitem;
DROP TABLE supplier;
DROP TABLE nation;
DROP TABLE q21_tmp1;
DROP TABLE q21_tmp2;
DROP TABLE q21_suppliers_who_kept_orders_waiting;