e38938b332
Uses PostgreSQL tuple estimates to provide a much faster yet approximate count. See https://wiki.postgresql.org/wiki/Slow_Counting for more details. We only use this fast method if the table has been analyzed or vacuumed within the last hour. Closes #46255
62 lines
2 KiB
Ruby
62 lines
2 KiB
Ruby
require 'spec_helper'
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describe Gitlab::Database::Count do
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before do
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create_list(:project, 3)
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end
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describe '.execute_estimate_if_updated_recently', :postgresql do
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context 'when reltuples have not been updated' do
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before do
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expect(described_class).to receive(:reltuples_updated_recently?).and_return(false)
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end
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it 'returns nil' do
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expect(described_class.execute_estimate_if_updated_recently(Project)).to be nil
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end
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end
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context 'when reltuples have been updated' do
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before do
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ActiveRecord::Base.connection.execute('ANALYZE projects')
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end
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it 'calls postgresql_estimate_query' do
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expect(described_class).to receive(:postgresql_estimate_query).with(Project).and_call_original
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expect(described_class.execute_estimate_if_updated_recently(Project)).to eq(3)
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end
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end
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end
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describe '.approximate_count' do
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context 'when reltuples have not been updated' do
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it 'counts all projects the normal way' do
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allow(described_class).to receive(:reltuples_updated_recently?).and_return(false)
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expect(Project).to receive(:count).and_call_original
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expect(described_class.approximate_count(Project)).to eq(3)
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end
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end
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context 'no permission' do
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it 'falls back to standard query' do
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allow(described_class).to receive(:reltuples_updated_recently?).and_raise(PG::InsufficientPrivilege)
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expect(Project).to receive(:count).and_call_original
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expect(described_class.approximate_count(Project)).to eq(3)
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end
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end
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describe 'when reltuples have been updated', :postgresql do
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before do
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ActiveRecord::Base.connection.execute('ANALYZE projects')
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end
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it 'counts all projects in the fast way' do
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expect(described_class).to receive(:postgresql_estimate_query).with(Project).and_call_original
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expect(described_class.approximate_count(Project)).to eq(3)
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end
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end
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end
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end
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