1 files changed, 36 insertions, 0 deletions
diff --git a/db/post_migrate/20210606143426_add_index_for_container_registry_access_level.rb b/db/post_migrate/20210606143426_add_index_for_container_registry_access_level.rb
new file mode 100644
index 00000000000..64d37054eb8
--- /dev/null
+++ b/db/post_migrate/20210606143426_add_index_for_container_registry_access_level.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class AddIndexForContainerRegistryAccessLevel < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::SchemaHelpers
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  INDEX = 'index_project_features_on_project_id_include_container_registry'
+
+  def up
+    if index_exists_by_name?('project_features', INDEX)
+      Gitlab::AppLogger.warn "Index not created because it already exists (this may be due to an aborted migration or similar): table_name: project_features, index_name: #{INDEX}"
+      return
+    end
+
+    begin
+      disable_statement_timeout do
+        execute "CREATE UNIQUE INDEX CONCURRENTLY #{INDEX} ON project_features " \
+          'USING btree (project_id) INCLUDE (container_registry_access_level)'
+      end
+    rescue ActiveRecord::StatementInvalid => ex
+      raise "The index #{INDEX} couldn't be added: #{ex.message}"
+    end
+
+    create_comment(
+      'INDEX',
+      INDEX,
+      'Included column (container_registry_access_level) improves performance of the ContainerRepository.for_group_and_its_subgroups scope query'
+    )
+  end
+
+  def down
+    remove_concurrent_index_by_name('project_features', INDEX)
+  end
+end