plpgsql/map_reduce at master · ashenoy95/plpgsql · GitHub

Name		Name	Last commit message	Last commit date
parent directory ..
README.md		README.md
join.sql		join.sql
projection.sql		projection.sql
set_diff.sql		set_diff.sql

README.md

Simulations of MapReduce in Postgres

join.sql: Implements the natural join of two relations R(A, B) and S(B, C).
projection.sql: Implements Pi_A(R) where R(A, B) is a relation.
set_diff.sql: Iimplements the set diﬀerence of two relations R(A) and S(A).

Assuming that the domain of A, B, and C is INTEGER.