Contents

# encoding: utf-8

require 'spec_helper'

describe Optimizer::Algebra::Summarization::EmptyOperand, '#optimize' do
  subject { object.optimize }

  let(:header)        { Relation::Header.coerce([[:id, Integer]])       }
  let(:base)          { Relation.new(header, LazyEnumerable.new([[1]])) }
  let(:attribute)     { Attribute::Object.new(:test)                    }
  let(:operand)       { base.restrict { false }                         }
  let(:summarize_per) { TABLE_DEE                                       }
  let(:object)        { described_class.new(relation)                   }

  context 'when the function has a default' do
    let(:relation) { operand.summarize(summarize_per) { |r| r.add(attribute, r.id.count) } }

    before do
      expect(object).to be_optimizable
    end

    it { should be_kind_of(Algebra::Extension) }

    it { should_not be(operand) }

    its(:operand) { should be(summarize_per) }

    its(:extensions) { should == { attribute => 0 } }
  end

  context 'when the function does not have a default' do
    let(:function) { ->(acc, tuple) { 1 }                                                }
    let(:relation) { operand.summarize(summarize_per) { |r| r.add(attribute, function) } }

    before do
      expect(object).to be_optimizable
    end

    it { should be_kind_of(Algebra::Extension) }

    it { should_not be(operand) }

    its(:operand) { should be(summarize_per) }

    its(:extensions) { should == { attribute => nil } }
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
axiom-optimizer-0.2.0	spec/unit/axiom/optimizer/algebra/summarization/empty_operand/optimize_spec.rb
axiom-optimizer-0.1.1	spec/unit/axiom/optimizer/algebra/summarization/empty_operand/optimize_spec.rb