1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::BatchCount do
let_it_be(:fallback) { ::Gitlab::Database::BatchCounter::FALLBACK }
let_it_be(:small_batch_size) { ::Gitlab::Database::BatchCounter::MIN_REQUIRED_BATCH_SIZE - 1 }
let(:model) { Issue }
let(:column) { :author_id }
let(:in_transaction) { false }
let_it_be(:user) { create(:user) }
let_it_be(:another_user) { create(:user) }
before_all do
create_list(:issue, 3, author: user)
create_list(:issue, 2, author: another_user)
end
before do
allow(ActiveRecord::Base.connection).to receive(:transaction_open?).and_return(in_transaction)
end
shared_examples 'disallowed configurations' do |method|
it 'returns fallback if start is bigger than finish' do
expect(described_class.public_send(method, *args, start: 1, finish: 0)).to eq(fallback)
end
it 'returns fallback if loops more than allowed' do
large_finish = Gitlab::Database::BatchCounter::MAX_ALLOWED_LOOPS * default_batch_size + 1
expect(described_class.public_send(method, *args, start: 1, finish: large_finish)).to eq(fallback)
end
it 'returns fallback if batch size is less than min required' do
expect(described_class.public_send(method, *args, batch_size: small_batch_size)).to eq(fallback)
end
end
shared_examples 'when a transaction is open' do
let(:in_transaction) { true }
it 'raises an error' do
expect { subject }.to raise_error('BatchCount can not be run inside a transaction')
end
end
describe '#batch_count' do
it 'counts table' do
expect(described_class.batch_count(model)).to eq(5)
end
it 'counts with :id field' do
expect(described_class.batch_count(model, :id)).to eq(5)
end
it 'counts with "id" field' do
expect(described_class.batch_count(model, 'id')).to eq(5)
end
it 'counts with table.id field' do
expect(described_class.batch_count(model, "#{model.table_name}.id")).to eq(5)
end
it 'counts with Arel column' do
expect(described_class.batch_count(model, model.arel_table[:id])).to eq(5)
end
it 'counts table with batch_size 50K' do
expect(described_class.batch_count(model, batch_size: 50_000)).to eq(5)
end
it 'will not count table with a batch size less than allowed' do
expect(described_class.batch_count(model, batch_size: small_batch_size)).to eq(fallback)
end
it 'counts with a small edge case batch_sizes than result' do
stub_const('Gitlab::Database::BatchCounter::MIN_REQUIRED_BATCH_SIZE', 0)
[1, 2, 4, 5, 6].each { |i| expect(described_class.batch_count(model, batch_size: i)).to eq(5) }
end
it 'counts with a start and finish' do
expect(described_class.batch_count(model, start: model.minimum(:id), finish: model.maximum(:id))).to eq(5)
end
it "defaults the batch size to #{Gitlab::Database::BatchCounter::DEFAULT_BATCH_SIZE}" do
min_id = model.minimum(:id)
expect_next_instance_of(Gitlab::Database::BatchCounter) do |batch_counter|
expect(batch_counter).to receive(:batch_fetch).with(min_id, Gitlab::Database::BatchCounter::DEFAULT_BATCH_SIZE + min_id, :itself).once.and_call_original
end
described_class.batch_count(model)
end
it_behaves_like 'when a transaction is open' do
subject { described_class.batch_count(model) }
end
context 'disallowed_configurations' do
include_examples 'disallowed configurations', :batch_count do
let(:args) { [Issue] }
let(:default_batch_size) { Gitlab::Database::BatchCounter::DEFAULT_BATCH_SIZE }
end
it 'raises an error if distinct count is requested' do
expect { described_class.batch_count(model.distinct(column)) }.to raise_error 'Use distinct count for optimized distinct counting'
end
end
end
describe '#batch_distinct_count' do
it 'counts with column field' do
expect(described_class.batch_distinct_count(model, column)).to eq(2)
end
it 'counts with "id" field' do
expect(described_class.batch_distinct_count(model, "#{column}")).to eq(2)
end
it 'counts with table.column field' do
expect(described_class.batch_distinct_count(model, "#{model.table_name}.#{column}")).to eq(2)
end
it 'counts with Arel column' do
expect(described_class.batch_distinct_count(model, model.arel_table[column])).to eq(2)
end
it 'counts with :column field with batch_size of 50K' do
expect(described_class.batch_distinct_count(model, column, batch_size: 50_000)).to eq(2)
end
it 'will not count table with a batch size less than allowed' do
expect(described_class.batch_distinct_count(model, column, batch_size: small_batch_size)).to eq(fallback)
end
it 'counts with a small edge case batch_sizes than result' do
stub_const('Gitlab::Database::BatchCounter::MIN_REQUIRED_BATCH_SIZE', 0)
[1, 2, 4, 5, 6].each { |i| expect(described_class.batch_distinct_count(model, column, batch_size: i)).to eq(2) }
end
it 'counts with a start and finish' do
expect(described_class.batch_distinct_count(model, column, start: model.minimum(column), finish: model.maximum(column))).to eq(2)
end
it 'counts with User min and max as start and finish' do
expect(described_class.batch_distinct_count(model, column, start: User.minimum(:id), finish: User.maximum(:id))).to eq(2)
end
it "defaults the batch size to #{Gitlab::Database::BatchCounter::DEFAULT_DISTINCT_BATCH_SIZE}" do
min_id = model.minimum(:id)
expect_next_instance_of(Gitlab::Database::BatchCounter) do |batch_counter|
expect(batch_counter).to receive(:batch_fetch).with(min_id, Gitlab::Database::BatchCounter::DEFAULT_DISTINCT_BATCH_SIZE + min_id, :distinct).once.and_call_original
end
described_class.batch_distinct_count(model)
end
it_behaves_like 'when a transaction is open' do
subject { described_class.batch_distinct_count(model, column) }
end
context 'disallowed configurations' do
include_examples 'disallowed configurations', :batch_distinct_count do
let(:args) { [model, column] }
let(:default_batch_size) { Gitlab::Database::BatchCounter::DEFAULT_DISTINCT_BATCH_SIZE }
end
it 'will raise an error if distinct count with the :id column is requested' do
expect do
described_class.batch_count(described_class.batch_distinct_count(model, :id))
end.to raise_error 'Use distinct count only with non id fields'
end
end
end
describe '#batch_sum' do
let(:column) { :weight }
before do
Issue.first.update_attribute(column, 3)
Issue.last.update_attribute(column, 4)
end
it 'returns the sum of values in the given column' do
expect(described_class.batch_sum(model, column)).to eq(7)
end
it 'works when given an Arel column' do
expect(described_class.batch_sum(model, model.arel_table[column])).to eq(7)
end
it 'works with a batch size of 50K' do
expect(described_class.batch_sum(model, column, batch_size: 50_000)).to eq(7)
end
it 'works with start and finish provided' do
expect(described_class.batch_sum(model, column, start: model.minimum(:id), finish: model.maximum(:id))).to eq(7)
end
it 'returns the same result regardless of batch size' do
stub_const('Gitlab::Database::BatchCounter::DEFAULT_SUM_BATCH_SIZE', 0)
(1..(model.count + 1)).each { |i| expect(described_class.batch_sum(model, column, batch_size: i)).to eq(7) }
end
it "defaults the batch size to #{Gitlab::Database::BatchCounter::DEFAULT_SUM_BATCH_SIZE}" do
min_id = model.minimum(:id)
expect_next_instance_of(Gitlab::Database::BatchCounter) do |batch_counter|
expect(batch_counter).to receive(:batch_fetch).with(min_id, Gitlab::Database::BatchCounter::DEFAULT_SUM_BATCH_SIZE + min_id, :itself).once.and_call_original
end
described_class.batch_sum(model, column)
end
it_behaves_like 'when a transaction is open' do
subject { described_class.batch_sum(model, column) }
end
it_behaves_like 'disallowed configurations', :batch_sum do
let(:args) { [model, column] }
let(:default_batch_size) { Gitlab::Database::BatchCounter::DEFAULT_SUM_BATCH_SIZE }
let(:small_batch_size) { Gitlab::Database::BatchCounter::DEFAULT_SUM_BATCH_SIZE - 1 }
end
end
end
|