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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::PostgresIndex do
let(:schema) { 'public' }
let(:name) { 'foo_idx' }
let(:identifier) { "#{schema}.#{name}" }
before do
ActiveRecord::Base.connection.execute(<<~SQL)
CREATE INDEX #{name} ON public.users (name);
CREATE UNIQUE INDEX bar_key ON public.users (id);
CREATE TABLE example_table (id serial primary key);
SQL
end
def find(name)
described_class.by_identifier(name)
end
it_behaves_like 'a postgres model'
describe '.reindexing_support' do
it 'only non partitioned indexes' do
expect(described_class.reindexing_support).to all(have_attributes(partitioned: false))
end
it 'only indexes that dont serve an exclusion constraint' do
expect(described_class.reindexing_support).to all(have_attributes(exclusion: false))
end
it 'only non-expression indexes' do
expect(described_class.reindexing_support).to all(have_attributes(expression: false))
end
it 'only btree and gist indexes' do
types = described_class.reindexing_support.map(&:type).uniq
expect(types & %w(btree gist)).to eq(types)
end
context 'with leftover indexes' do
before do
ActiveRecord::Base.connection.execute(<<~SQL)
CREATE INDEX foobar_ccnew ON users (id);
CREATE INDEX foobar_ccnew1 ON users (id);
SQL
end
subject { described_class.reindexing_support.map(&:name) }
it 'excludes temporary indexes from reindexing' do
expect(subject).not_to include('foobar_ccnew')
expect(subject).not_to include('foobar_ccnew1')
end
end
end
describe '.reindexing_leftovers' do
subject { described_class.reindexing_leftovers }
before do
ActiveRecord::Base.connection.execute(<<~SQL)
CREATE INDEX foobar_ccnew ON users (id);
CREATE INDEX foobar_ccnew1 ON users (id);
SQL
end
it 'retrieves leftover indexes matching the /_ccnew[0-9]*$/ pattern' do
expect(subject.map(&:name)).to eq(%w(foobar_ccnew foobar_ccnew1))
end
end
describe '.not_match' do
it 'excludes indexes matching the given regex' do
expect(described_class.not_match('^bar_k').map(&:name)).to all(match(/^(?!bar_k).*/))
end
it 'matches indexes without this prefix regex' do
expect(described_class.not_match('^bar_k')).not_to be_empty
end
end
describe '#bloat_size' do
subject { build(:postgres_index, bloat_estimate: bloat_estimate) }
let(:bloat_estimate) { build(:postgres_index_bloat_estimate) }
let(:bloat_size) { double }
it 'returns the bloat size from the estimate' do
expect(bloat_estimate).to receive(:bloat_size).and_return(bloat_size)
expect(subject.bloat_size).to eq(bloat_size)
end
context 'without a bloat estimate available' do
let(:bloat_estimate) { nil }
it 'returns 0' do
expect(subject.bloat_size).to eq(0)
end
end
end
describe '#relative_bloat_level' do
subject { build(:postgres_index, bloat_estimate: bloat_estimate, ondisk_size_bytes: 1024) }
let(:bloat_estimate) { build(:postgres_index_bloat_estimate, bloat_size: 256) }
it 'calculates the relative bloat level' do
expect(subject.relative_bloat_level).to eq(0.25)
end
end
describe '#reset' do
subject { index.reset }
let(:index) { described_class.by_identifier(identifier) }
it 'calls #reload' do
expect(index).to receive(:reload).once.and_call_original
subject
end
it 'resets the bloat estimation' do
expect(index).to receive(:clear_memoization).with(:bloat_size).and_call_original
subject
end
end
describe '#unique?' do
it 'returns true for a unique index' do
expect(find('public.bar_key')).to be_unique
end
it 'returns false for a regular, non-unique index' do
expect(find('public.foo_idx')).not_to be_unique
end
it 'returns true for a primary key index' do
expect(find('public.example_table_pkey')).to be_unique
end
end
describe '#valid_index?' do
it 'returns true if the index is invalid' do
expect(find(identifier)).to be_valid_index
end
it 'returns false if the index is marked as invalid' do
ActiveRecord::Base.connection.execute(<<~SQL)
UPDATE pg_index SET indisvalid=false
FROM pg_class
WHERE pg_class.relname = 'foo_idx' AND pg_index.indexrelid = pg_class.oid
SQL
expect(find(identifier)).not_to be_valid_index
end
end
describe '#definition' do
it 'returns the index definition' do
expect(find(identifier).definition).to eq('CREATE INDEX foo_idx ON public.users USING btree (name)')
end
end
end
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