Contents

# encoding: utf-8

require 'spec_helper'

describe Algebra::Projection do
  context 'remove attributes in predicate' do
    subject { restriction.project([:name]) }

    let(:left)        { Relation.new([[:id, Integer]], (0..11).map { |n| [n] })                            }
    let(:right)       { Relation.new([[:name, String]], [['Dan Kubb'], ['John Doe'], ['Jane Doe']])        }
    let(:relation)    { left * right                                                                       }
    let(:restriction) { relation.restrict { |r| r.id.gte(1).and(r.id.lte(10)).and(r.name.eq('Dan Kubb')) } }

    it 'returns a relation with a single tuple' do
      should == [['Dan Kubb']]
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
axiom-0.2.0	spec/integration/axiom/algebra/projection_spec.rb
axiom-0.1.1	spec/integration/axiom/algebra/projection_spec.rb