Contents

# encoding: utf-8

require 'spec_helper'

describe Optimizer::Algebra::Join::MaterializedLeft, '#optimizable?' do
  subject { object.optimizable? }

  let(:relation) { left.join(right)              }
  let(:object)   { described_class.new(relation) }

  before do
    expect(object.operation).to be_kind_of(Algebra::Join)
  end

  context 'when the left is materialized and right is not a restriction' do
    let(:left)  { Relation.new([[:id, Integer], [:name, String]], [[1, 'Dan Kubb']])             }
    let(:right) { Relation.new([[:id, Integer], [:age, Integer]], LazyEnumerable.new([[1, 35]])) }

    it { should be(true) }
  end

  context 'when the left is materialized and right is a restriction not matching the left' do
    let(:left)  { Relation.new([[:id, Integer], [:name, String]], [[1, 'Dan Kubb']])                                           }
    let(:right) { Relation.new([[:id, Integer], [:age, Integer]], LazyEnumerable.new([[1, 35]])).restrict { |r| r.age.eq(35) } }

    it { should be(true) }
  end

  context 'when the left is materialized and right is a restriction matching the left' do
    let(:left)  { Relation.new([[:id, Integer], [:name, String]], [[1, 'Dan Kubb']])                                         }
    let(:right) { Relation.new([[:id, Integer], [:age, Integer]], LazyEnumerable.new([[1, 35]])).restrict { |r| r.id.eq(1) } }

    it { should be(false) }
  end

  context 'when the left is not materialized' do
    let(:left)  { Relation.new([[:id, Integer], [:name, String]], LazyEnumerable.new([[1, 'Dan Kubb']])) }
    let(:right) { Relation.new([[:id, Integer], [:age, Integer]], LazyEnumerable.new([[1, 35]]))         }

    it { should be(false) }
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
axiom-optimizer-0.2.0	spec/unit/axiom/optimizer/algebra/join/materialized_left/optimizable_predicate_spec.rb
axiom-optimizer-0.1.1	spec/unit/axiom/optimizer/algebra/join/materialized_left/optimizable_predicate_spec.rb