@ -0,0 +1,8 @@
from relational.optimizer import optimize_program
a = optimize_program('''ppl_skills = people ⧓skills
ppl_skills1 = ppl_skills ∪ (people ⧓skills)
ppl_skills ∩ ppl_skills1 ⧓ dates''', {})
assert a == '''optm_a = people⧓skills
optm_b = optm_a⧓dates'''