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require 'spec_helper'
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) }
def to_sql(relation)
relation.reorder(nil).to_sql
end
describe '#to_sql' do
it 'returns a String joining relations together using a UNION' do
union = described_class.new([relation_1, relation_2])
expect(union.to_sql).to eq("(#{to_sql(relation_1)})\nUNION\n(#{to_sql(relation_2)})")
end
it 'skips Model.none segements' 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(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
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