Remove code related to object hierarchy in MySQL

These are not required because MySQL is not
supported anymore

app/controllers/application_controller.rb

@@ -421,7 +421,7 @@ class ApplicationController < ActionController::Base
   end
 
   def manifest_import_enabled?
-    Group.supports_nested_objects? && Gitlab::CurrentSettings.import_sources.include?('manifest')
+    Gitlab::CurrentSettings.import_sources.include?('manifest')
   end
 
   def phabricator_import_enabled?

app/controllers/concerns/group_tree.rb

@@ -32,18 +32,14 @@ module GroupTree
   def filtered_groups_with_ancestors(groups)
     filtered_groups = groups.search(params[:filter]).page(params[:page])
 
-    if Group.supports_nested_objects?
-      # We find the ancestors by ID of the search results here.
-      # Otherwise the ancestors would also have filters applied,
-      # which would cause them not to be preloaded.
-      #
-      # Pagination needs to be applied before loading the ancestors to
-      # make sure ancestors are not cut off by pagination.
-      Gitlab::ObjectHierarchy.new(Group.where(id: filtered_groups.select(:id)))
-        .base_and_ancestors
-    else
-      filtered_groups
-    end
+    # We find the ancestors by ID of the search results here.
+    # Otherwise the ancestors would also have filters applied,
+    # which would cause them not to be preloaded.
+    #
+    # Pagination needs to be applied before loading the ancestors to
+    # make sure ancestors are not cut off by pagination.
+    Gitlab::ObjectHierarchy.new(Group.where(id: filtered_groups.select(:id)))
+      .base_and_ancestors
   end
   # rubocop: enable CodeReuse/ActiveRecord
 end

app/finders/group_descendants_finder.rb

@@ -132,8 +132,6 @@ class GroupDescendantsFinder
   end
 
   def subgroups
-    return Group.none unless Group.supports_nested_objects?
-
     # When filtering subgroups, we want to find all matches within the tree of
     # descendants to show to the user
     groups = if params[:filter]

app/graphql/types/group_type.rb

@@ -14,11 +14,9 @@ module Types
       group.avatar_url(only_path: false)
     end
 
-    if ::Group.supports_nested_objects?
-      field :parent, GroupType,
-            null: true,
-            resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Group, obj.parent_id).find }
-    end
+    field :parent, GroupType,
+          null: true,
+          resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Group, obj.parent_id).find }
   end
 end
 

app/helpers/groups_helper.rb

@@ -127,10 +127,6 @@ module GroupsHelper
     groups.to_json
   end
 
-  def supports_nested_groups?
-    Group.supports_nested_objects?
-  end
-
   private
 
   def get_group_sidebar_links

app/models/concerns/descendant.rb

-# frozen_string_literal: true
-
-module Descendant
-  extend ActiveSupport::Concern
-
-  class_methods do
-    def supports_nested_objects?
-      Gitlab::Database.postgresql?
-    end
-  end
-end

app/models/group.rb

@@ -10,7 +10,6 @@ class Group < Namespace
   include Referable
   include SelectForProjectAuthorization
   include LoadedInGroupList
-  include Descendant
   include GroupDescendant
   include TokenAuthenticatable
   include WithUploads

app/models/namespace.rb

@@ -332,8 +332,6 @@ class Namespace < ApplicationRecord
   end
 
   def force_share_with_group_lock_on_descendants
-    return unless Group.supports_nested_objects?
-
     # We can't use `descendants.update_all` since Rails will throw away the WITH
     # RECURSIVE statement. We also can't use WHERE EXISTS since we can't use
     # different table aliases, hence we're just using WHERE IN. Since we have a

app/policies/group_policy.rb

@@ -16,8 +16,6 @@ class GroupPolicy < BasePolicy
   condition(:maintainer) { access_level >= GroupMember::MAINTAINER }
   condition(:reporter) { access_level >= GroupMember::REPORTER }
 
-  condition(:nested_groups_supported, scope: :global) { Group.supports_nested_objects? }
-
   condition(:has_parent, scope: :subject) { @subject.has_parent? }
   condition(:share_with_group_locked, scope: :subject) { @subject.share_with_group_lock? }
   condition(:parent_share_with_group_locked, scope: :subject) { @subject.parent&.share_with_group_lock? }
@@ -108,8 +106,8 @@ class GroupPolicy < BasePolicy
     enable :read_nested_project_resources
   end
 
-  rule { owner & nested_groups_supported }.enable :create_subgroup
-  rule { maintainer & maintainer_can_create_group & nested_groups_supported }.enable :create_subgroup
+  rule { owner }.enable :create_subgroup
+  rule { maintainer & maintainer_can_create_group }.enable :create_subgroup
 
   rule { public_group | logged_in_viewable }.enable :view_globally
 

app/services/groups/nested_create_service.rb

@@ -18,10 +18,6 @@ module Groups
         return namespace
       end
 
-      if group_path.include?('/') && !Group.supports_nested_objects?
-        raise 'Nested groups are not supported on MySQL'
-      end
-
       create_group_path
     end
 

app/services/groups/transfer_service.rb

@@ -43,7 +43,6 @@ module Groups
 
     def ensure_allowed_transfer
       raise_transfer_error(:group_is_already_root) if group_is_already_root?
-      raise_transfer_error(:database_not_supported) unless Group.supports_nested_objects?
       raise_transfer_error(:same_parent_as_current) if same_parent?
       raise_transfer_error(:invalid_policies) unless valid_policies?
       raise_transfer_error(:namespace_with_same_path) if namespace_with_same_path?

app/services/members/destroy_service.rb

@@ -31,7 +31,7 @@ module Members
       return unless member.is_a?(GroupMember) && member.user && member.group
 
       delete_project_members(member)
-      delete_subgroup_members(member) if Group.supports_nested_objects?
+      delete_subgroup_members(member)
     end
 
     def delete_project_members(member)

app/services/users/refresh_authorized_projects_service.rb

@@ -102,13 +102,7 @@ module Users
     end
 
     def fresh_authorizations
-      klass = if Group.supports_nested_objects?
-                Gitlab::ProjectAuthorizations::WithNestedGroups
-              else
-                Gitlab::ProjectAuthorizations::WithoutNestedGroups
-              end
-
-      klass.new(user).calculate
+      Gitlab::ProjectAuthorizations.new(user).calculate
     end
   end
 end

app/views/groups/settings/_advanced.html.haml

@@ -23,20 +23,19 @@
 
     = f.submit 'Change group path', class: 'btn btn-warning'
 
-- if supports_nested_groups?
-  .sub-section
-    %h4.warning-title Transfer group
-    = form_for @group, url: transfer_group_path(@group), method: :put do |f|
-      .form-group
-        = dropdown_tag('Select parent group', options: { toggle_class: 'js-groups-dropdown', title: 'Parent Group', filter: true, dropdown_class: 'dropdown-open-top dropdown-group-transfer', placeholder: 'Search groups', data: { data: parent_group_options(@group) } })
-        = hidden_field_tag 'new_parent_group_id'
+.sub-section
+  %h4.warning-title Transfer group
+  = form_for @group, url: transfer_group_path(@group), method: :put do |f|
+    .form-group
+      = dropdown_tag('Select parent group', options: { toggle_class: 'js-groups-dropdown', title: 'Parent Group', filter: true, dropdown_class: 'dropdown-open-top dropdown-group-transfer', placeholder: 'Search groups', data: { data: parent_group_options(@group) } })
+      = hidden_field_tag 'new_parent_group_id'
 
-      %ul
-        %li Be careful. Changing a group's parent can have unintended #{link_to 'side effects', 'https://docs.gitlab.com/ce/user/project/index.html#redirects-when-changing-repository-paths', target: 'blank'}.
-        %li You can only transfer the group to a group you manage.
-        %li You will need to update your local repositories to point to the new location.
-        %li If the parent group's visibility is lower than the group current visibility, visibility levels for subgroups and projects will be changed to match the new parent group's visibility.
-      = f.submit 'Transfer group', class: 'btn btn-warning'
+    %ul
+      %li Be careful. Changing a group's parent can have unintended #{link_to 'side effects', 'https://docs.gitlab.com/ce/user/project/index.html#redirects-when-changing-repository-paths', target: 'blank'}.
+      %li You can only transfer the group to a group you manage.
+      %li You will need to update your local repositories to point to the new location.
+      %li If the parent group's visibility is lower than the group current visibility, visibility levels for subgroups and projects will be changed to match the new parent group's visibility.
+    = f.submit 'Transfer group', class: 'btn btn-warning'
 
 .sub-section
   %h4.danger-title= _('Remove group')

ee/app/assets/javascripts/epic/components/epic_body.vue

@@ -25,7 +25,6 @@ export default {
       'canUpdate',
       'canDestroy',
       'canAdmin',
-      'subepicsSupported',
       'initialTitleHtml',
       'initialTitleText',
       'initialDescriptionHtml',
@@ -64,7 +63,7 @@ export default {
       />
     </div>
     <related-items
-      v-if="subepicsSupported && !isEpicTreeEnabled"
+      v-if="!isEpicTreeEnabled"
       :endpoint="epicLinksEndpoint"
       :can-admin="canAdmin"
       :can-reorder="canAdmin"

ee/app/assets/javascripts/epic/store/state.js

@@ -21,7 +21,6 @@ export default () => ({
   canUpdate: false,
   canDestroy: false,
   canAdmin: false,
-  subepicsSupported: false,
 
   // Epic Information
   epicId: 0,

ee/app/controllers/groups/epic_links_controller.rb

@@ -3,8 +3,6 @@
 class Groups::EpicLinksController < Groups::ApplicationController
   include EpicRelations
 
-  before_action :check_nested_support!
-
   def update
     result = EpicLinks::UpdateService.new(child_epic, current_user, params[:epic]).execute
 
@@ -30,8 +28,4 @@ class Groups::EpicLinksController < Groups::ApplicationController
   def child_epic
     @child_epic ||= Epic.find(params[:id])
   end
-
-  def check_nested_support!
-    render_404 unless Epic.supports_nested_objects?
-  end
 end

ee/app/helpers/ee/issuables_helper.rb

@@ -21,7 +21,6 @@ module EE
       if parent.is_a?(Group)
         data[:issueLinksEndpoint] = group_epic_issues_path(parent, issuable)
         data[:epicLinksEndpoint] = group_epic_links_path(parent, issuable)
-        data[:subepicsSupported] = ::Epic.supports_nested_objects?
         data[:fullPath] = parent.full_path
       end
 

ee/app/models/ee/epic.rb

@@ -12,7 +12,6 @@ module EE
       include Referable
       include Awardable
       include LabelEventable
-      include Descendant
       include RelativePositioning
 
       enum state: { opened: 1, closed: 2 }
@@ -164,8 +163,6 @@ module EE
       # epic2 - parent: epic1
       # Returns: 2
       def deepest_relationship_level
-        return unless supports_nested_objects?
-
         ::Gitlab::ObjectHierarchy.new(self.where(parent_id: nil)).max_descendants_depth
       end
 

ee/lib/ee/gitlab/quick_actions/epic_actions.rb

@@ -82,7 +82,7 @@ module EE
           end
 
           def action_allowed?
-            ::Epic.supports_nested_objects? && quick_action_target.group&.feature_available?(:epics) &&
+            quick_action_target.group&.feature_available?(:epics) &&
               current_user.can?(:"admin_#{quick_action_target.to_ability_name}", quick_action_target)
           end
         end

ee/lib/ee/gitlab/usage_data.rb

@@ -136,12 +136,9 @@ module EE
             projects_with_packages: count(::Packages::Package.select('distinct project_id')),
             projects_with_prometheus_alerts: count(PrometheusAlert.distinct_projects),
             projects_with_tracing_enabled: count(ProjectTracingSetting)
-          }).merge(service_desk_counts).merge(security_products_usage)
-
-          # MySql does not support recursive queries so we can't retrieve epics relationship depth
-          if ::Group.supports_nested_objects?
-            usage_data[:counts] = usage_data[:counts].merge(epics_deepest_relationship_level)
-          end
+          }).merge(service_desk_counts)
+            .merge(security_products_usage)
+            .merge(epics_deepest_relationship_level)
 
           usage_data
         end

ee/spec/controllers/admin/geo/nodes_controller_spec.rb

 # frozen_string_literal: true
 require 'spec_helper'
 
-describe Admin::Geo::NodesController, :postgresql do
+describe Admin::Geo::NodesController do
   shared_examples 'unlicensed geo action' do
     it 'redirects to the license page' do
       expect(response).to redirect_to(admin_license_path)

ee/spec/controllers/concerns/ee/routable_actions/sso_enforcement_redirect_spec.rb

@@ -93,7 +93,7 @@ describe EE::RoutableActions::SsoEnforcementRedirect do
       it_behaves_like 'a routable SSO url'
     end
 
-    context 'with a nested group', :nested_groups do
+    context 'with a nested group' do
       subject { described_class.new(nested_group) }
 
       it_behaves_like 'a routable SSO url'
@@ -105,7 +105,7 @@ describe EE::RoutableActions::SsoEnforcementRedirect do
       it_behaves_like 'a routable SSO url'
     end
 
-    context 'with a nested project', :nested_groups do
+    context 'with a nested project' do
       subject { described_class.new(nested_project) }
 
       it_behaves_like 'a routable SSO url'

ee/spec/controllers/concerns/routable_actions_spec.rb

@@ -58,7 +58,7 @@ describe RoutableActions do
         include_examples 'sso redirects'
       end
 
-      describe 'for a nested group', :nested_groups do
+      describe 'for a nested group' do
         let(:routable) { create(:group, :private, parent: root_group) }
 
         include_examples 'sso redirects'
@@ -70,7 +70,7 @@ describe RoutableActions do
         include_examples 'sso redirects'
       end
 
-      describe 'for a nested project', :nested_groups do
+      describe 'for a nested project' do
         let(:routable) { create(:project, :private, group: create(:group, :private, parent: root_group)) }
 
         include_examples 'sso redirects'

ee/spec/controllers/groups/epic_links_controller_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Groups::EpicLinksController, :postgresql do
+describe Groups::EpicLinksController do
   let(:group) { create(:group, :public) }
   let(:parent_epic) { create(:epic, group: group) }
   let(:epic1) { create(:epic, group: group) }

ee/spec/controllers/groups/saml_providers_controller_spec.rb

@@ -96,7 +96,7 @@ describe Groups::SamlProvidersController do
         expect(assigns(:scim_token_url)).to eq("http://localhost/api/scim/v2/groups/#{group.full_path}")
       end
 
-      context 'not on a top level group', :nested_groups do
+      context 'not on a top level group' do
         let(:group) { create(:group, :nested) }
 
         it_behaves_like '404 status'

ee/spec/features/billings/billing_plans_spec.rb

@@ -158,7 +158,7 @@ describe 'Billing plan pages', :feature do
     end
   end
 
-  context 'on sub-group', :nested_groups do
+  context 'on sub-group' do
     let(:user2) { create(:user) }
     let(:user3) { create(:user) }
     let(:group) { create(:group, plan: :bronze_plan) }

ee/spec/features/epics/epic_issues_spec.rb

@@ -55,7 +55,7 @@ describe 'Epic Issues', :js do
       expect(page).not_to have_selector('.related-items-tree-container .js-add-issues-button')
     end
 
-    it 'user cannot add new epics to the epic', :postgresql do
+    it 'user cannot add new epics to the epic' do
       expect(page).not_to have_selector('.related-items-tree-container .js-add-epics-button')
     end
   end
@@ -109,7 +109,7 @@ describe 'Epic Issues', :js do
       end
     end
 
-    it 'user can see all epics of the group and delete the associations', :postgresql do
+    it 'user can see all epics of the group and delete the associations' do
       within('.related-items-tree-container ul.related-items-list') do
         expect(page).to have_selector('li.js-item-type-epic', count: 2)
         expect(page).to have_content(nested_epics[0].title)
@@ -146,7 +146,7 @@ describe 'Epic Issues', :js do
       end
     end
 
-    it 'user can add new epics to the epic', :postgresql do
+    it 'user can add new epics to the epic' do
       references = "#{epic_to_add.to_reference(full: true)}"
       add_epics(references)
 

ee/spec/features/groups/group_settings_spec.rb

@@ -148,7 +148,7 @@ describe 'Edit group settings' do
     end
   end
 
-  context 'when custom_project_templates feature', :postgresql do
+  context 'when custom_project_templates feature' do
     let!(:subgroup) { create(:group, :public, parent: group) }
     let!(:subgroup_1) { create(:group, :public, parent: subgroup) }
 

ee/spec/features/labels_hierarchy.rb

 require 'spec_helper'
 
-describe 'Labels Hierarchy', :js, :nested_groups do
+describe 'Labels Hierarchy', :js do
   let!(:user) { create(:user) }
   let!(:grandparent) { create(:group) }
   let!(:parent) { create(:group, parent: grandparent) }

ee/spec/features/projects/members/invite_group_and_members_spec.rb

@@ -104,7 +104,7 @@ describe 'Project > Members > Invite group and members', :js do
       end
     end
 
-    context 'for a project in a subgroup', :nested_groups do
+    context 'for a project in a subgroup' do
       let(:root_group) { create(:group) }
       let(:subgroup) { create(:group, parent: root_group) }
       let(:project) { create(:project, namespace: subgroup) }

ee/spec/features/projects/new_project_spec.rb

@@ -177,7 +177,7 @@ describe 'New project' do
     end
   end
 
-  context 'Group-level project templates', :js, :postgresql do
+  context 'Group-level project templates', :js do
     def visit_create_from_group_template_tab
       visit url
       click_link 'Create from template'

ee/spec/finders/boards/milestones_finder_spec.rb

@@ -18,7 +18,7 @@ describe Boards::MilestonesFinder do
     let(:user) { create(:user) }
     let(:finder) { described_class.new(board, user) }
 
-    context 'when project board', :nested_groups do
+    context 'when project board' do
       let(:board) { create(:board, project: nested_group_project, group: nil) }
 
       it 'returns milestones from board project and ancestors groups' do
@@ -32,7 +32,7 @@ describe Boards::MilestonesFinder do
       end
     end
 
-    context 'when group board', :nested_groups do
+    context 'when group board' do
       let(:board) { create(:board, project: nil, group: nested_group) }
 
       it 'returns milestones from board group and its ancestors' do

ee/spec/finders/epics_finder_spec.rb

@@ -110,7 +110,7 @@ describe EpicsFinder do
           end
         end
 
-        context 'when subgroups are supported', :nested_groups do
+        context 'when subgroups are supported' do
           let(:subgroup) { create(:group, :private, parent: group) }
           let(:subgroup2) { create(:group, :private, parent: subgroup) }
           let!(:subepic1) { create(:epic, group: subgroup) }

ee/spec/finders/geo/repository_verification_finder_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoryVerificationFinder, :postgresql do
+describe Geo::RepositoryVerificationFinder do
   set(:project) { create(:project) }
 
   describe '#find_failed_repositories' do

ee/spec/graphql/resolvers/epic_resolver_spec.rb

@@ -60,7 +60,7 @@ describe Resolvers::EpicResolver do
         end
       end
 
-      context 'with subgroups', :nested_groups do
+      context 'with subgroups' do
         let(:sub_group) { create(:group, parent: group) }
         let(:iids)      { [epic1, epic2].map(&:iid) }
         let!(:epic3)    { create(:epic, group: sub_group, iid: epic1.iid) }

ee/spec/helpers/ee/issuables_helper_spec.rb

@@ -35,8 +35,7 @@ describe IssuablesHelper do
         initialTitleText: epic.title,
         initialDescriptionHtml: '<p dir="auto">epic text</p>',
         initialDescriptionText: 'epic text',
-        initialTaskStatus: '0 of 0 tasks completed',
-        subepicsSupported: Gitlab::Database.postgresql?
+        initialTaskStatus: '0 of 0 tasks completed'
       }
       expect(helper.issuable_initial_data(epic)).to eq(expected_data)
     end

ee/spec/helpers/ee/namespaces_helper_spec.rb

 # frozen_string_literal: true
 require 'spec_helper'
 
-describe EE::NamespacesHelper, :postgresql do
+describe EE::NamespacesHelper do
   let!(:admin) { create(:admin) }
   let!(:admin_project_creation_level) { nil }
   let!(:admin_group) do

ee/spec/lib/ee/api/entities/geo_node_status_spec.rb

 require 'spec_helper'
 
-describe EE::API::Entities::GeoNodeStatus, :postgresql do
+describe EE::API::Entities::GeoNodeStatus do
   include ::EE::GeoHelpers
 
   let(:geo_node_status) { build(:geo_node_status) }

ee/spec/lib/gitlab/custom_file_templates_spec.rb

@@ -83,7 +83,7 @@ describe Gitlab::CustomFileTemplates do
           end
         end
 
-        context 'in a subgroup', :nested_groups do
+        context 'in a subgroup' do
           set(:subgroup) { create(:group, parent: group) }
           set(:subproject) { create(:project, namespace: subgroup) }
           set(:subgroup_template_project) { create(:project, :custom_repo, namespace: subgroup, files: template_files('subgroup')) }
@@ -151,7 +151,7 @@ describe Gitlab::CustomFileTemplates do
           end
         end
 
-        context 'in a subgroup', :nested_groups do
+        context 'in a subgroup' do
           let(:subgroup) { create(:group, parent: group) }
           let(:subproject) { create(:project, namespace: subgroup) }
           let(:subgroup_template_project) { create(:project, :custom_repo, namespace: subgroup, files: template_files('subgroup')) }

ee/spec/lib/gitlab/database/load_balancing/host_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Database::LoadBalancing::Host, :postgresql do
+describe Gitlab::Database::LoadBalancing::Host do
   let(:load_balancer) do
     Gitlab::Database::LoadBalancing::LoadBalancer.new(%w[localhost])
   end

ee/spec/lib/gitlab/geo/log_cursor/daemon_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Daemon, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Daemon, :clean_gitlab_redis_shared_state do
   include ::EE::GeoHelpers
   include ExclusiveLeaseHelpers
 

ee/spec/lib/gitlab/geo/log_cursor/event_logs_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::EventLogs, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::EventLogs, :clean_gitlab_redis_shared_state do
   subject { described_class.new }
 
   describe '#fetch_in_batches' do

ee/spec/lib/gitlab/geo/log_cursor/events/cache_invalidation_event_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::CacheInvalidationEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::CacheInvalidationEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :cache_invalidation_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/hashed_storage_attachments_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::HashedStorageAttachmentsEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::HashedStorageAttachmentsEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :hashed_storage_attachments_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/hashed_storage_migrated_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::HashedStorageMigratedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::HashedStorageMigratedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :hashed_storage_migration_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/job_artifact_deleted_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::JobArtifactDeletedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::JobArtifactDeletedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :job_artifact_deleted_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/lfs_object_deleted_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::LfsObjectDeletedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::LfsObjectDeletedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :lfs_object_deleted_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/repositories_changed_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::RepositoriesChangedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::RepositoriesChangedEvent, :clean_gitlab_redis_shared_state do
   include ::EE::GeoHelpers
 
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }

ee/spec/lib/gitlab/geo/log_cursor/events/repository_created_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::RepositoryCreatedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::RepositoryCreatedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:project) { create(:project) }
   let(:repository_created_event) { create(:geo_repository_created_event, project: project) }

ee/spec/lib/gitlab/geo/log_cursor/events/repository_deleted_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::RepositoryDeletedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::RepositoryDeletedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :deleted_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/repository_renamed_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::RepositoryRenamedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::RepositoryRenamedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :renamed_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/repository_updated_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::RepositoryUpdatedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::RepositoryUpdatedEvent, :clean_gitlab_redis_shared_state do
   include ::EE::GeoHelpers
 
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }

ee/spec/lib/gitlab/geo/log_cursor/events/reset_checksum_event_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::ResetChecksumEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::ResetChecksumEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:event_log) { create(:geo_event_log, :reset_checksum_event) }
   let!(:event_log_state) { create(:geo_event_log_state, event_id: event_log.id - 1) }

ee/spec/lib/gitlab/geo/log_cursor/events/upload_deleted_event_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Geo::LogCursor::Events::UploadDeletedEvent, :postgresql, :clean_gitlab_redis_shared_state do
+describe Gitlab::Geo::LogCursor::Events::UploadDeletedEvent, :clean_gitlab_redis_shared_state do
   let(:logger) { Gitlab::Geo::LogCursor::Logger.new(described_class, Logger::INFO) }
   let(:project) { create(:project) }
   let(:upload_deleted_event) { create(:geo_upload_deleted_event, project: project) }

ee/spec/lib/gitlab/insights/finders/issuable_finder_spec.rb

@@ -166,7 +166,7 @@ RSpec.describe Gitlab::Insights::Finders::IssuableFinder do
       end
     end
 
-    context 'for a group with subgroups', :nested_groups do
+    context 'for a group with subgroups' do
       include_examples 'group tests' do
         let(:project) { create(:project, :public, group: create(:group, parent: entity)) }
       end

ee/spec/lib/gitlab/usage_data_spec.rb

@@ -88,7 +88,7 @@ describe Gitlab::UsageData do
       expect(count_data[:feature_flags]).to eq(1)
     end
 
-    it 'gathers deepest epic relationship level', :postgresql do
+    it 'gathers deepest epic relationship level' do
       expect(count_data.keys).to include(:epics_deepest_relationship_level)
     end
 

ee/spec/models/burndown_spec.rb

@@ -169,7 +169,7 @@ describe Burndown do
     let(:parent_group_milestone) { create(:milestone, project: nil, group: parent_group, start_date: start_date, due_date: due_date) }
     let(:group_milestone) { create(:milestone, group: group, start_date: start_date, due_date: due_date) }
 
-    context 'when nested group milestone', :nested_groups do
+    context 'when nested group milestone' do
       before do
         parent_group.add_developer(user)
       end

ee/spec/models/concerns/elastic/project_spec.rb

@@ -74,7 +74,7 @@ describe Project, :elastic do
         end
       end
 
-      it 'indexes only projects under the group', :nested_groups do
+      it 'indexes only projects under the group' do
         Sidekiq::Testing.inline! do
           create :project, name: 'test1', group: create(:group, parent: group)
           create :project, name: 'test2', description: 'awesome project'

ee/spec/models/epic_spec.rb

@@ -118,7 +118,7 @@ describe Epic do
         expect(epic.valid_parent?).to be_falsey
       end
 
-      it 'returns false when level is too deep', :nested_groups do
+      it 'returns false when level is too deep' do
         epic1 = create(:epic, group: group)
         epic2 = create(:epic, group: group, parent: epic1)
         epic3 = create(:epic, group: group, parent: epic2)
@@ -142,7 +142,7 @@ describe Epic do
         expect(epic.valid_parent?).to be_truthy
       end
 
-      it 'returns false when total depth after adding would exceed limit', :nested_groups do
+      it 'returns false when total depth after adding would exceed limit' do
         child_epic2 = create(:epic, group: group, parent: child_epic1)
         child_epic3 = create(:epic, group: group, parent: child_epic2)
         child_epic4 = create(:epic, group: group, parent: child_epic3)
@@ -166,7 +166,7 @@ describe Epic do
         expect(epic.valid_parent?).to be_truthy
       end
 
-      it 'returns false when total depth after adding would exceed limit', :nested_groups do
+      it 'returns false when total depth after adding would exceed limit' do
         root_epic.update(parent: create(:epic, group: group))
         create(:epic, group: group, parent: child_epic1)
 
@@ -185,14 +185,14 @@ describe Epic do
         expect(epic.valid_parent?).to be_falsey
       end
 
-      it 'returns false when child epic is parent of the given parent', :nested_groups do
+      it 'returns false when child epic is parent of the given parent' do
         epic1 = create(:epic, group: group, parent: epic)
         epic.parent = epic1
 
         expect(epic.valid_parent?).to be_falsey
       end
 
-      it 'returns false when child epic is an ancestor of the given parent', :nested_groups do
+      it 'returns false when child epic is an ancestor of the given parent' do
         epic1 = create(:epic, group: group, parent: epic)
         epic2 = create(:epic, group: group, parent: epic1)
         epic.parent = epic2
@@ -207,7 +207,7 @@ describe Epic do
     let(:epic2) { create(:epic, group: group, parent: epic1) }
     let(:epic3) { create(:epic, group: group, parent: epic2) }
 
-    describe '#ancestors', :nested_groups do
+    describe '#ancestors' do
       it 'returns all ancestors for an epic' do
         expect(epic3.ancestors).to eq [epic2, epic1]
       end
@@ -217,7 +217,7 @@ describe Epic do
       end
     end
 
-    describe '#descendants', :nested_groups do
+    describe '#descendants' do
       it 'returns all descendants for an epic' do
         expect(epic1.descendants).to match_array([epic2, epic3])
       end
@@ -576,7 +576,7 @@ describe Epic do
     end
   end
 
-  describe '.deepest_relationship_level', :postgresql do
+  describe '.deepest_relationship_level' do
     context 'when there are no epics' do
       it 'returns nil' do
         expect(described_class.deepest_relationship_level).to be_nil

ee/spec/models/gitlab_subscription_spec.rb

@@ -48,14 +48,14 @@ describe GitlabSubscription do
       expect(gitlab_subscription.seats_in_use).to eq(1)
     end
 
-    it 'also counts users from subgroups', :postgresql do
+    it 'also counts users from subgroups' do
       group.add_developer(user_1)
       subgroup_1.add_developer(user_2)
 
       expect(gitlab_subscription.seats_in_use).to eq(2)
     end
 
-    it 'does not count duplicated members', :postgresql do
+    it 'does not count duplicated members' do
       group.add_developer(user_1)
       subgroup_1.add_developer(user_2)
       subgroup_2.add_developer(user_2)

ee/spec/models/namespace_spec.rb

@@ -213,13 +213,11 @@ describe Namespace do
           end
         end
 
-        if Group.supports_nested_objects?
-          context 'when license is applied to parent group' do
-            let(:child_group) { create :group, parent: group }
+        context 'when license is applied to parent group' do
+          let(:child_group) { create :group, parent: group }
 
-            it 'child group has feature available' do
-              expect(child_group.feature_available?(feature)).to be_truthy
-            end
+          it 'child group has feature available' do
+            expect(child_group.feature_available?(feature)).to be_truthy
           end
         end
       end
@@ -460,7 +458,7 @@ describe Namespace do
 
         it { is_expected.to be_truthy }
 
-        context 'when is subgroup', :nested_groups do
+        context 'when is subgroup' do
           before do
             namespace.parent = build(:group)
           end
@@ -478,7 +476,7 @@ describe Namespace do
   describe '#shared_runners_enabled?' do
     subject { namespace.shared_runners_enabled? }
 
-    context 'subgroup with shared runners enabled project', :nested_groups do
+    context 'subgroup with shared runners enabled project' do
       let(:subgroup) { create(:group, parent: namespace) }
       let!(:subproject) { create(:project, namespace: subgroup, shared_runners_enabled: true) }
 
@@ -776,7 +774,7 @@ describe Namespace do
     end
   end
 
-  describe '#membership_lock with subgroups', :nested_groups do
+  describe '#membership_lock with subgroups' do
     context 'when creating a subgroup' do
       let(:subgroup) { create(:group, parent: root_group) }
 

ee/spec/models/pg_replication_slot_spec.rb

 require 'spec_helper'
 
-describe PgReplicationSlot, :postgresql do
+describe PgReplicationSlot do
   if Gitlab::Database.replication_slots_supported?
     describe 'with replication slot support' do
       it '#max_replication_slots' do
         expect(described_class.max_replication_slots).to be >= 0
       end
 
-      skip_examples = PgReplicationSlot.max_replication_slots <= PgReplicationSlot.count
+      skip_examples = described_class.max_replication_slots <= described_class.count
       context 'with enough slots available' do
         before(:all) do
           skip('max_replication_slots too small') if skip_examples
@@ -37,11 +37,11 @@ describe PgReplicationSlot, :postgresql do
         end
 
         it '#max_retained_wal' do
-          expect(PgReplicationSlot.max_retained_wal).not_to be_nil
+          expect(described_class.max_retained_wal).not_to be_nil
         end
 
         it '#slots_retained_bytes' do
-          slot = PgReplicationSlot.slots_retained_bytes.find {|x| x['slot_name'] == 'test_slot' }
+          slot = described_class.slots_retained_bytes.find {|x| x['slot_name'] == 'test_slot' }
 
           expect(slot).not_to be_nil
           expect(slot['retained_bytes']).to be_nil

ee/spec/models/project_spec.rb

@@ -598,7 +598,7 @@ describe Project do
 
     subject { project.root_namespace }
 
-    context 'when namespace has parent group', :nested_groups do
+    context 'when namespace has parent group' do
       let(:root_ancestor) { create(:group) }
       let(:parent) { create(:group, parent: root_ancestor) }
 
@@ -616,7 +616,7 @@ describe Project do
     end
   end
 
-  describe '#shared_runners_limit_namespace', :nested_groups do
+  describe '#shared_runners_limit_namespace' do
     set(:root_ancestor) { create(:group) }
     set(:group) { create(:group, parent: root_ancestor) }
     let(:project) { create(:project, namespace: group) }

ee/spec/models/user_spec.rb

@@ -329,7 +329,7 @@ describe User do
     end
   end
 
-  describe '#available_subgroups_with_custom_project_templates', :postgresql do
+  describe '#available_subgroups_with_custom_project_templates' do
     let(:user) { create(:user) }
 
     context 'without Groups with custom project templates' do

ee/spec/policies/group_policy_spec.rb

@@ -348,7 +348,7 @@ describe GroupPolicy do
     end
   end
 
-  describe 'private nested group use the highest access level from the group and inherited permissions', :nested_groups do
+  describe 'private nested group use the highest access level from the group and inherited permissions' do
     let(:nested_group) { create(:group, :private, parent: group) }
 
     before do

ee/spec/presenters/epic_presenter_spec.rb

@@ -29,7 +29,7 @@ describe EpicPresenter do
       expect(presenter.show_data.keys).to match_array([:initial, :meta])
     end
 
-    it 'has correct ancestors', :nested_groups do
+    it 'has correct ancestors' do
       metadata     = JSON.parse(presenter.show_data[:meta])
       ancestor_url = metadata['ancestors'].first['url']
 
@@ -48,7 +48,7 @@ describe EpicPresenter do
       expect(data[:meta]).to match_schema('epic_meta_data', dir: 'ee')
     end
 
-    it 'avoids N+1 database queries', :nested_groups do
+    it 'avoids N+1 database queries' do
       group1 = create(:group)
       group2 = create(:group, parent: group1)
       epic1 = create(:epic, group: group1)

ee/spec/requests/api/geo_spec.rb

@@ -244,7 +244,7 @@ describe API::Geo do
     end
   end
 
-  describe 'POST /geo/status', :postgresql do
+  describe 'POST /geo/status' do
     let(:geo_base_request) { Gitlab::Geo::BaseRequest.new(scope: ::Gitlab::Geo::API_SCOPE) }
 
     let(:data) do

ee/spec/requests/api/v3/github_spec.rb

@@ -308,7 +308,7 @@ describe API::V3::Github do
       end
     end
 
-    context 'nested group namespace', :nested_groups do
+    context 'nested group namespace' do
       let(:group) { create(:group, :nested) }
       let!(:parent_group_project) { create(:project, group: group.parent, name: 'parent_group_project') }
       let!(:child_group_project) { create(:project, group: group, name: 'child_group_project') }

ee/spec/requests/groups_controller_spec.rb

@@ -91,7 +91,7 @@ describe GroupsController, type: :request do
         end
       end
 
-      context 'subgroup', :nested_groups do
+      context 'subgroup' do
         let(:group) { create(:group, :nested) }
 
         it 'does not create ip restriction' do

ee/spec/serializers/geo_project_registry_entity_spec.rb

 require 'spec_helper'
 
-describe GeoProjectRegistryEntity, :postgresql do
+describe GeoProjectRegistryEntity do
   let(:registry) { create(:geo_project_registry, :synced) }
 
   let(:entity) do

ee/spec/serializers/storage_shard_entity_spec.rb

 require 'spec_helper'
 
-describe StorageShardEntity, :postgresql do
+describe StorageShardEntity do
   let(:entity) { described_class.new(StorageShard.new, request: double) }
 
   subject { entity.as_json }

ee/spec/services/ci/register_job_service_spec.rb

@@ -86,7 +86,7 @@ describe Ci::RegisterJobService do
         end
       end
 
-      context 'when group is subgroup', :nested_groups do
+      context 'when group is subgroup' do
         let!(:root_ancestor) { create(:group) }
         let!(:group) { create(:group, parent: root_ancestor) }
         let!(:project) { create :project, shared_runners_enabled: true, group: group }

ee/spec/services/epic_issues/create_service_spec.rb

@@ -152,7 +152,7 @@ describe EpicIssues::CreateService do
             include_examples 'returns success'
           end
 
-          context 'when a link of an issue in a subgroup is given', :nested_groups do
+          context 'when a link of an issue in a subgroup is given' do
             let(:subgroup) { create(:group, parent: group) }
             let(:project2) { create(:project, group: subgroup) }
             let(:issue) { create(:issue, project: project2) }

ee/spec/services/epic_links/create_service_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe EpicLinks::CreateService, :postgresql do
+describe EpicLinks::CreateService do
   describe '#execute' do
     let(:group) { create(:group) }
     let(:user) { create(:user) }

ee/spec/services/epic_links/destroy_service_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe EpicLinks::DestroyService, :postgresql do
+describe EpicLinks::DestroyService do
   describe '#execute' do
     let(:group) { create(:group) }
     let(:user) { create(:user) }

ee/spec/services/epic_links/list_service_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe EpicLinks::ListService, :postgresql do
+describe EpicLinks::ListService do
   let(:user) { create :user }
   let(:group) { create(:group, :public) }
   let(:parent_epic) { create(:epic, group: group) }

ee/spec/services/groups/autocomplete_service_spec.rb

@@ -54,7 +54,7 @@ describe Groups::AutocompleteService do
     end
   end
 
-  describe '#issues', :nested_groups do
+  describe '#issues' do
     let(:project) { create(:project, group: group) }
     let(:sub_group_project) { create(:project, group: sub_group) }
 
@@ -67,7 +67,7 @@ describe Groups::AutocompleteService do
     end
   end
 
-  describe '#merge_requests', :nested_groups do
+  describe '#merge_requests' do
     let(:project) { create(:project, :repository, group: group) }
     let(:sub_group_project) { create(:project, :repository, group: sub_group) }
 
@@ -104,10 +104,10 @@ describe Groups::AutocompleteService do
       end
 
       it 'returns available commands' do
-        available_commands = [:todo, :unsubscribe, :award, :shrug, :tableflip, :cc, :title, :close]
-        if ::Epic.supports_nested_objects?
-          available_commands += [:child_epic, :remove_child_epic, :parent_epic, :remove_parent_epic]
-        end
+        available_commands = [
+          :todo, :unsubscribe, :award, :shrug, :tableflip, :cc, :title, :close,
+          :child_epic, :remove_child_epic, :parent_epic, :remove_parent_epic
+        ]
 
         expect(subject.commands(epic).map { |c| c[:name] }).to match_array(available_commands)
       end
@@ -131,7 +131,7 @@ describe Groups::AutocompleteService do
         subgroup_milestone.update(group: public_subgroup)
       end
 
-      it 'returns milestones from groups and subgroups', :nested_groups do
+      it 'returns milestones from groups and subgroups' do
         subject = described_class.new(public_subgroup, user)
 
         expect(subject.milestones.map(&:iid)).to contain_exactly(group_milestone.iid, subgroup_milestone.iid)
@@ -144,14 +144,14 @@ describe Groups::AutocompleteService do
       expect(subject.milestones.map(&:title)).to contain_exactly(group_milestone.title)
     end
 
-    it 'returns milestones from groups and subgroups', :nested_groups do
+    it 'returns milestones from groups and subgroups' do
       milestones = described_class.new(sub_group, user).milestones
 
       expect(milestones.map(&:iid)).to contain_exactly(group_milestone.iid, subgroup_milestone.iid)
       expect(milestones.map(&:title)).to contain_exactly(group_milestone.title, subgroup_milestone.title)
     end
 
-    it 'returns only milestones that user can read', :nested_groups do
+    it 'returns only milestones that user can read' do
       user = create(:user)
       sub_group.add_guest(user)
 

ee/spec/services/groups/participants_service_spec.rb

@@ -47,7 +47,7 @@ describe Groups::ParticipantsService do
     end
   end
 
-  describe '#group_members', :nested_groups do
+  describe '#group_members' do
     let(:parent_group) { create(:group) }
     let(:group) { create(:group, parent: parent_group) }
     let(:subgroup) { create(:group_with_members, parent: group) }

ee/spec/services/groups/update_service_spec.rb

@@ -108,7 +108,7 @@ describe Groups::UpdateService, '#execute' do
         expect(group.errors[:file_template_project_id]).to include('is invalid')
       end
 
-      context 'in a subgroup', :nested_groups do
+      context 'in a subgroup' do
         let(:parent_group) { create(:group) }
         let(:hidden_project) { create(:project, :private, namespace: parent_group) }
         let(:group) { create(:group, parent: parent_group) }

ee/spec/services/projects/create_from_template_service_spec.rb

@@ -113,7 +113,7 @@ describe Projects::CreateFromTemplateService do
     it_behaves_like 'creates project from custom template', nil
     it_behaves_like 'creates project from custom template', ''
 
-    describe 'creating project from a Group project template', :postgresql do
+    describe 'creating project from a Group project template' do
       let(:project_name) { project_template.name }
       let(:group_with_project_templates_id) { subgroup_1_2.id }
       let(:group2) { create(:group) }

ee/spec/services/quick_actions/interpret_service_spec.rb

@@ -298,7 +298,7 @@ describe QuickActions::InterpretService do
       end
     end
 
-    context 'child_epic command', :nested_groups do
+    context 'child_epic command' do
       let(:subgroup) { create(:group, parent: group) }
       let(:another_group) { create(:group) }
       let(:merge_request) { create(:merge_request, source_project: project) }
@@ -427,7 +427,7 @@ describe QuickActions::InterpretService do
       end
     end
 
-    context 'remove_child_epic command', :nested_groups do
+    context 'remove_child_epic command' do
       let(:subgroup) { create(:group, parent: group) }
       let(:another_group) { create(:group) }
       let(:merge_request) { create(:merge_request, source_project: project) }

ee/spec/services/update_build_minutes_service_spec.rb

@@ -43,7 +43,7 @@ describe UpdateBuildMinutesService do
         end
       end
 
-      context 'when namespace is subgroup', :nested_groups do
+      context 'when namespace is subgroup' do
         let(:root_ancestor) { create(:group, shared_runners_minutes_limit: 100) }
         let(:namespace) { create(:namespace, parent: root_ancestor) }
 

ee/spec/support/shared_examples/models/member_shared_examples.rb

@@ -31,7 +31,7 @@ shared_examples_for 'member validations' do
           expect(member.errors.messages[:user]).to eq(['is not linked to a SAML account'])
         end
 
-        context 'subgroups', :nested_groups do
+        context 'subgroups' do
           let!(:subgroup) { create(:group, parent: group) }
 
           before do

ee/spec/views/admin/groups/_form.html.haml_spec.rb

@@ -10,7 +10,7 @@ describe 'admin/groups/_form' do
     allow(view).to receive(:visibility_level) { group.visibility_level }
   end
 
-  context 'when sub group is used', :nested_groups do
+  context 'when sub group is used' do
     let(:root_ancestor) { create(:group) }
     let(:group) { build(:group, parent: root_ancestor) }
 

ee/spec/views/groups/edit.html.haml_spec.rb

@@ -33,7 +33,7 @@ describe 'groups/edit.html.haml' do
       end
     end
 
-    context 'subgroup', :nested_groups do
+    context 'subgroup' do
       let(:group) { create(:group, :nested) }
 
       before do

ee/spec/workers/clear_shared_runners_minutes_worker_spec.rb

@@ -48,7 +48,7 @@ describe ClearSharedRunnersMinutesWorker do
       end
     end
 
-    context 'when namespace has extra shared runner minutes', :postgresql do
+    context 'when namespace has extra shared runner minutes' do
       let!(:namespace) do
         create(:namespace, shared_runners_minutes_limit: 100, extra_shared_runners_minutes_limit: 10 )
       end

ee/spec/workers/geo/repository_verification/primary/batch_worker_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoryVerification::Primary::BatchWorker, :postgresql, :clean_gitlab_redis_cache do
+describe Geo::RepositoryVerification::Primary::BatchWorker, :clean_gitlab_redis_cache do
   include ::EE::GeoHelpers
 
   set(:healthy_not_verified) { create(:project) }

ee/spec/workers/geo/repository_verification/primary/shard_worker_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoryVerification::Primary::ShardWorker, :postgresql, :clean_gitlab_redis_cache do
+describe Geo::RepositoryVerification::Primary::ShardWorker, :clean_gitlab_redis_cache do
   include ::EE::GeoHelpers
   include ExclusiveLeaseHelpers
 

ee/spec/workers/geo/repository_verification/primary/single_worker_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoryVerification::Primary::SingleWorker, :postgresql, :clean_gitlab_redis_cache do
+describe Geo::RepositoryVerification::Primary::SingleWorker, :clean_gitlab_redis_cache do
   include ::EE::GeoHelpers
   include ExclusiveLeaseHelpers
 

ee/spec/workers/geo/repository_verification/secondary/scheduler_worker_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoryVerification::Secondary::SchedulerWorker, :postgresql, :clean_gitlab_redis_cache do
+describe Geo::RepositoryVerification::Secondary::SchedulerWorker, :clean_gitlab_redis_cache do
   include ::EE::GeoHelpers
 
   set(:healthy_not_verified) { create(:project) }

ee/spec/workers/geo/repository_verification/secondary/single_worker_spec.rb

 require 'spec_helper'
 
-describe Geo::RepositoryVerification::Secondary::SingleWorker, :postgresql, :clean_gitlab_redis_cache do
+describe Geo::RepositoryVerification::Secondary::SingleWorker, :clean_gitlab_redis_cache do
   include ::EE::GeoHelpers
   include ExclusiveLeaseHelpers
 

ee/spec/workers/update_max_seats_used_for_gitlab_com_subscriptions_worker_spec.rb

 require 'spec_helper'
 
-describe UpdateMaxSeatsUsedForGitlabComSubscriptionsWorker, :postgresql do
+describe UpdateMaxSeatsUsedForGitlabComSubscriptionsWorker do
   subject { described_class.new }
 
   let!(:user)                { create(:user) }

lib/api/entities.rb

@@ -366,10 +366,7 @@ module API
       end
       expose :request_access_enabled
       expose :full_name, :full_path
-
-      if ::Group.supports_nested_objects?
-        expose :parent_id
-      end
+      expose :parent_id
 
       expose :custom_attributes, using: 'API::Entities::CustomAttribute', if: :with_custom_attributes
 

lib/api/groups.rb

@@ -114,10 +114,7 @@ module API
       params do
         requires :name, type: String, desc: 'The name of the group'
         requires :path, type: String, desc: 'The path of the group'
-
-        if ::Group.supports_nested_objects?
-          optional :parent_id, type: Integer, desc: 'The parent group id for creating nested group'
-        end
+        optional :parent_id, type: Integer, desc: 'The parent group id for creating nested group'
 
         use :optional_params
       end

lib/gitlab/object_hierarchy.rb

@@ -32,11 +32,6 @@ module Gitlab
     # Returns the maximum depth starting from the base
     # A base object with no children has a maximum depth of `1`
     def max_descendants_depth
-      unless hierarchy_supported?
-        # This makes the return value consistent with the case where hierarchy is supported
-        return descendants_base.exists? ? 1 : nil
-      end
-
       base_and_descendants(with_depth: true).maximum(DEPTH_COLUMN)
     end
 
@@ -66,8 +61,6 @@ module Gitlab
     # each parent.
     # rubocop: disable CodeReuse/ActiveRecord
     def base_and_ancestors(upto: nil, hierarchy_order: nil)
-      return ancestors_base unless hierarchy_supported?
-
       recursive_query = base_and_ancestors_cte(upto, hierarchy_order).apply_to(model.all)
       recursive_query = recursive_query.order(depth: hierarchy_order) if hierarchy_order
 
@@ -81,10 +74,6 @@ module Gitlab
     # When `with_depth` is `true`, a `depth` column is included where it starts with `1` for the base objects
     # and incremented as we go down the descendant tree
     def base_and_descendants(with_depth: false)
-      unless hierarchy_supported?
-        return with_depth ? descendants_base.select("1 as #{DEPTH_COLUMN}", objects_table[Arel.star]) : descendants_base
-      end
-
       read_only(base_and_descendants_cte(with_depth: with_depth).apply_to(model.all))
     end
 
@@ -112,8 +101,6 @@ module Gitlab
     # If nested objects are not supported, ancestors_base is returned.
     # rubocop: disable CodeReuse/ActiveRecord
     def all_objects
-      return ancestors_base unless hierarchy_supported?
-
       ancestors = base_and_ancestors_cte
       descendants = base_and_descendants_cte
 
@@ -135,10 +122,6 @@ module Gitlab
 
     private
 
-    def hierarchy_supported?
-      Gitlab::Database.postgresql?
-    end
-
     # rubocop: disable CodeReuse/ActiveRecord
     def base_and_ancestors_cte(stop_id = nil, hierarchy_order = nil)
       cte = SQL::RecursiveCTE.new(:base_and_ancestors)

lib/gitlab/project_authorizations.rb

+# frozen_string_literal: true
+
+# This class relies on Common Table Expressions to efficiently get all data,
+# including data for nested groups.
+module Gitlab
+  class ProjectAuthorizations
+    attr_reader :user
+
+    # user - The User object for which to calculate the authorizations.
+    def initialize(user)
+      @user = user
+    end
+
+    def calculate
+      cte = recursive_cte
+      cte_alias = cte.table.alias(Group.table_name)
+      projects = Project.arel_table
+      links = ProjectGroupLink.arel_table
+
+      relations = [
+        # The project a user has direct access to.
+        user.projects.select_for_project_authorization,
+
+        # The personal projects of the user.
+        user.personal_projects.select_as_maintainer_for_project_authorization,
+
+        # Projects that belong directly to any of the groups the user has
+        # access to.
+        Namespace
+          .unscoped
+          .select([alias_as_column(projects[:id], 'project_id'),
+                   cte_alias[:access_level]])
+          .from(cte_alias)
+          .joins(:projects),
+
+        # Projects shared with any of the namespaces the user has access to.
+        Namespace
+          .unscoped
+          .select([
+            links[:project_id],
+            least(cte_alias[:access_level], links[:group_access], 'access_level')
+          ])
+          .from(cte_alias)
+          .joins('INNER JOIN project_group_links ON project_group_links.group_id = namespaces.id')
+          .joins('INNER JOIN projects ON projects.id = project_group_links.project_id')
+          .joins('INNER JOIN namespaces p_ns ON p_ns.id = projects.namespace_id')
+          .where('p_ns.share_with_group_lock IS FALSE')
+      ]
+
+      ProjectAuthorization
+        .unscoped
+        .with
+        .recursive(cte.to_arel)
+        .select_from_union(relations)
+    end
+
+    private
+
+    # Builds a recursive CTE that gets all the groups the current user has
+    # access to, including any nested groups.
+    def recursive_cte
+      cte = Gitlab::SQL::RecursiveCTE.new(:namespaces_cte)
+      members = Member.arel_table
+      namespaces = Namespace.arel_table
+
+      # Namespaces the user is a member of.
+      cte << user.groups
+        .select([namespaces[:id], members[:access_level]])
+        .except(:order)
+
+      # Sub groups of any groups the user is a member of.
+      cte << Group.select([
+          namespaces[:id],
+          greatest(members[:access_level], cte.table[:access_level], 'access_level')
+        ])
+        .joins(join_cte(cte))
+        .joins(join_members)
+        .except(:order)
+
+      cte
+    end
+
+    # Builds a LEFT JOIN to join optional memberships onto the CTE.
+    def join_members
+      members = Member.arel_table
+      namespaces = Namespace.arel_table
+
+      cond = members[:source_id]
+        .eq(namespaces[:id])
+        .and(members[:source_type].eq('Namespace'))
+        .and(members[:requested_at].eq(nil))
+        .and(members[:user_id].eq(user.id))
+
+      Arel::Nodes::OuterJoin.new(members, Arel::Nodes::On.new(cond))
+    end
+
+    # Builds an INNER JOIN to join namespaces onto the CTE.
+    def join_cte(cte)
+      namespaces = Namespace.arel_table
+      cond = cte.table[:id].eq(namespaces[:parent_id])
+
+      Arel::Nodes::InnerJoin.new(cte.table, Arel::Nodes::On.new(cond))
+    end
+
+    def greatest(left, right, column_alias)
+      sql_function('GREATEST', [left, right], column_alias)
+    end
+
+    def least(left, right, column_alias)
+      sql_function('LEAST', [left, right], column_alias)
+    end
+
+    def sql_function(name, args, column_alias)
+      alias_as_column(Arel::Nodes::NamedFunction.new(name, args), column_alias)
+    end
+
+    def alias_as_column(value, alias_to)
+      Arel::Nodes::As.new(value, Arel::Nodes::SqlLiteral.new(alias_to))
+    end
+  end
+end

lib/gitlab/project_authorizations/with_nested_groups.rb

-# frozen_string_literal: true
-
-module Gitlab
-  module ProjectAuthorizations
-    # Calculating new project authorizations when supporting nested groups.
-    #
-    # This class relies on Common Table Expressions to efficiently get all data,
-    # including data for nested groups. As a result this class can only be used
-    # on PostgreSQL.
-    class WithNestedGroups
-      attr_reader :user
-
-      # user - The User object for which to calculate the authorizations.
-      def initialize(user)
-        @user = user
-      end
-
-      def calculate
-        cte = recursive_cte
-        cte_alias = cte.table.alias(Group.table_name)
-        projects = Project.arel_table
-        links = ProjectGroupLink.arel_table
-
-        relations = [
-          # The project a user has direct access to.
-          user.projects.select_for_project_authorization,
-
-          # The personal projects of the user.
-          user.personal_projects.select_as_maintainer_for_project_authorization,
-
-          # Projects that belong directly to any of the groups the user has
-          # access to.
-          Namespace
-            .unscoped
-            .select([alias_as_column(projects[:id], 'project_id'),
-                     cte_alias[:access_level]])
-            .from(cte_alias)
-            .joins(:projects),
-
-          # Projects shared with any of the namespaces the user has access to.
-          Namespace
-            .unscoped
-            .select([links[:project_id],
-                     least(cte_alias[:access_level],
-                           links[:group_access],
-                           'access_level')])
-            .from(cte_alias)
-            .joins('INNER JOIN project_group_links ON project_group_links.group_id = namespaces.id')
-            .joins('INNER JOIN projects ON projects.id = project_group_links.project_id')
-            .joins('INNER JOIN namespaces p_ns ON p_ns.id = projects.namespace_id')
-            .where('p_ns.share_with_group_lock IS FALSE')
-        ]
-
-        ProjectAuthorization
-          .unscoped
-          .with
-          .recursive(cte.to_arel)
-          .select_from_union(relations)
-      end
-
-      private
-
-      # Builds a recursive CTE that gets all the groups the current user has
-      # access to, including any nested groups.
-      def recursive_cte
-        cte = Gitlab::SQL::RecursiveCTE.new(:namespaces_cte)
-        members = Member.arel_table
-        namespaces = Namespace.arel_table
-
-        # Namespaces the user is a member of.
-        cte << user.groups
-          .select([namespaces[:id], members[:access_level]])
-          .except(:order)
-
-        # Sub groups of any groups the user is a member of.
-        cte << Group.select([namespaces[:id],
-                             greatest(members[:access_level],
-                                      cte.table[:access_level], 'access_level')])
-          .joins(join_cte(cte))
-          .joins(join_members)
-          .except(:order)
-
-        cte
-      end
-
-      # Builds a LEFT JOIN to join optional memberships onto the CTE.
-      def join_members
-        members = Member.arel_table
-        namespaces = Namespace.arel_table
-
-        cond = members[:source_id]
-          .eq(namespaces[:id])
-          .and(members[:source_type].eq('Namespace'))
-          .and(members[:requested_at].eq(nil))
-          .and(members[:user_id].eq(user.id))
-
-        Arel::Nodes::OuterJoin.new(members, Arel::Nodes::On.new(cond))
-      end
-
-      # Builds an INNER JOIN to join namespaces onto the CTE.
-      def join_cte(cte)
-        namespaces = Namespace.arel_table
-        cond = cte.table[:id].eq(namespaces[:parent_id])
-
-        Arel::Nodes::InnerJoin.new(cte.table, Arel::Nodes::On.new(cond))
-      end
-
-      def greatest(left, right, column_alias)
-        sql_function('GREATEST', [left, right], column_alias)
-      end
-
-      def least(left, right, column_alias)
-        sql_function('LEAST', [left, right], column_alias)
-      end
-
-      def sql_function(name, args, column_alias)
-        alias_as_column(Arel::Nodes::NamedFunction.new(name, args), column_alias)
-      end
-
-      def alias_as_column(value, alias_to)
-        Arel::Nodes::As.new(value, Arel::Nodes::SqlLiteral.new(alias_to))
-      end
-    end
-  end
-end

lib/gitlab/project_authorizations/without_nested_groups.rb

-# frozen_string_literal: true
-
-module Gitlab
-  module ProjectAuthorizations
-    # Calculating new project authorizations when not supporting nested groups.
-    class WithoutNestedGroups
-      attr_reader :user
-
-      # user - The User object for which to calculate the authorizations.
-      def initialize(user)
-        @user = user
-      end
-
-      def calculate
-        relations = [
-          # Projects the user is a direct member of
-          user.projects.select_for_project_authorization,
-
-          # Personal projects
-          user.personal_projects.select_as_maintainer_for_project_authorization,
-
-          # Projects of groups the user is a member of
-          user.groups_projects.select_for_project_authorization,
-
-          # Projects shared with groups the user is a member of
-          user.groups.joins(:shared_projects).select_for_project_authorization
-        ]
-
-        ProjectAuthorization
-          .unscoped
-          .select_from_union(relations)
-      end
-    end
-  end
-end

spec/controllers/boards/issues_controller_spec.rb

@@ -85,7 +85,7 @@ describe Boards::IssuesController do
           expect { list_issues(user: user, board: group_board, list: list3) }.not_to exceed_query_limit(control_count + (2 * 8 - 1))
         end
 
-        it 'avoids N+1 database queries when adding a subgroup, project, and issue', :nested_groups do
+        it 'avoids N+1 database queries when adding a subgroup, project, and issue' do
           create(:project, group: sub_group_1)
           create(:labeled_issue, project: project, labels: [development])
           control_count = ActiveRecord::QueryRecorder.new { list_issues(user: user, board: group_board, list: list3) }.count