Merge branch 'dz-create-routes-lower-index' into 'master'

Add index to routes table on lower path for postgresql

Improve performance of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7121 

See merge request !8041

db/migrate/20161212142807_add_lower_path_index_to_routes.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddLowerPathIndexToRoutes < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab::Database.postgresql?
+
+    execute 'CREATE INDEX CONCURRENTLY index_on_routes_lower_path ON routes (LOWER(path));'
+  end
+
+  def down
+    return unless Gitlab::Database.postgresql?
+
+    remove_index :routes, name: :index_on_routes_lower_path
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161202152035) do
+ActiveRecord::Schema.define(version: 20161212142807) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"

lib/tasks/migrate/setup_postgresql.rake

+require Rails.root.join('lib/gitlab/database')
+require Rails.root.join('lib/gitlab/database/migration_helpers')
 require Rails.root.join('db/migrate/20151007120511_namespaces_projects_path_lower_indexes')
 require Rails.root.join('db/migrate/20151008110232_add_users_lower_username_email_indexes')
+require Rails.root.join('db/migrate/20161212142807_add_lower_path_index_to_routes')
 
 desc 'GitLab | Sets up PostgreSQL'
 task setup_postgresql: :environment do
   NamespacesProjectsPathLowerIndexes.new.up
   AddUsersLowerUsernameEmailIndexes.new.up
+  AddLowerPathIndexToRoutes.new.up
 end