A GpuMapRDD is required

[meisam]

For example, to simulate this query

Select a, b, a * b, a+b from
MyTable

we need a way to map an RDD of Tuple2(Int, Int) to an RDD of Tuple4(Int, Int, Int, Int)

This is really required because in TPCH queries we have expressions like

select
sum(l_quantity) as sum_qty,
sum(l_extendedprice) as sum_base_price,
...,
avg(l_quantity) as avg_qty,
avg(l_extendedprice) as avg_price,
from
lineitem