Contents

# encoding: utf-8

require 'spec_helper'

describe Optimizer::Algebra::Rename::RestrictionOperand, '#optimizable?' do
  subject { object.optimizable? }

  let(:header)    { Relation::Header.coerce([[:id, Integer]])       }
  let(:base)      { Relation.new(header, LazyEnumerable.new([[1]])) }
  let(:predicate) { base[:id].eq(1)                                 }
  let(:relation)  { operand.rename(id: :other_id)                   }
  let(:object)    { described_class.new(relation)                   }

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

  context 'when the operand is a restriction' do
    let(:operand) { base.restrict { predicate } }

    it { should be(true) }
  end

  context 'when the operand is not a restriction' do
    let(:operand) { base }

    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/rename/restriction_operand/optimizable_predicate_spec.rb
axiom-optimizer-0.1.1	spec/unit/axiom/optimizer/algebra/rename/restriction_operand/optimizable_predicate_spec.rb