Re: TPC-R benchmarks

I continue struggling with the TPC-R benchmarks and wonder if anyone
could help me optimize the query below. ANALYZE statistics indicate that
the query should run relatively fast, but it takes hours to complete. I
attached the query plan to this posting.
Thanks.

select
nation,
o_year,
sum(amount) as sum_profit
from
(
select
n_name as nation,
extract(year from o_orderdate) as o_year,
l_extendedprice * (1 - l_discount) -
ps_supplycost * l_quantity as amount
from
part,
supplier,
lineitem,
partsupp,
orders,
nation
where
s_suppkey = l_suppkey
and ps_suppkey = l_suppkey
and ps_partkey = l_partkey
and p_partkey = l_partkey
and o_orderkey = l_orderkey
and s_nationkey = n_nationkey
and p_name like '%aquamarine%'
) as profit
group by
nation,
o_year
order by
nation,
o_year desc;

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