diff options
Diffstat (limited to 'spec/lib/gitlab/sql/union_spec.rb')
-rw-r--r-- | spec/lib/gitlab/sql/union_spec.rb | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/spec/lib/gitlab/sql/union_spec.rb b/spec/lib/gitlab/sql/union_spec.rb index 849edb09476..fe6422c32b6 100644 --- a/spec/lib/gitlab/sql/union_spec.rb +++ b/spec/lib/gitlab/sql/union_spec.rb @@ -1,6 +1,6 @@ require 'spec_helper' -describe Gitlab::SQL::Union, lib: true do +describe Gitlab::SQL::Union do let(:relation_1) { User.where(email: 'alice@example.com').select(:id) } let(:relation_2) { User.where(email: 'bob@example.com').select(:id) } @@ -19,8 +19,22 @@ describe Gitlab::SQL::Union, lib: true do empty_relation = User.none union = described_class.new([empty_relation, relation_1, relation_2]) - expect{User.where("users.id IN (#{union.to_sql})").to_a}.not_to raise_error + expect {User.where("users.id IN (#{union.to_sql})").to_a}.not_to raise_error expect(union.to_sql).to eq("#{to_sql(relation_1)}\nUNION\n#{to_sql(relation_2)}") end + + it 'uses UNION ALL when removing duplicates is disabled' do + union = described_class + .new([relation_1, relation_2], remove_duplicates: false) + + expect(union.to_sql).to include('UNION ALL') + end + + it 'returns `NULL` if all relations are empty' do + empty_relation = User.none + union = described_class.new([empty_relation, empty_relation]) + + expect(union.to_sql).to eq('NULL') + end end end |