Hash Semi-Join - 2023.2 English

Hash Semi-Join resides in L1/benchmarks/hash_semi_join directory. This project shows FPGA performance of the following query with random-generated data, implemented with hashSemiJoin primitive.

SELECT
       SUM(l_extendedprice * (1 - l_discount)) as revenue
FROM
       Lineitem
WHERE
       l_orderkey
IN
   (
      SELECT
              o_orderkey
      FROM
              Orders
      WHERE
              o_orderdate >= date '1994-01-01'
              and o_orderdate < date '1995-01-01'
  )
;

Here Orders is a self-made table filled with random data, which contains 2 columns named o_orderkey and o_orderdate;

Lineitem is also a table, which contains 3 columns named l_orderkey, l_extendedprice and l_discount.