Add index for users.group_view

db/schema.rb

@@ -3119,6 +3119,7 @@ ActiveRecord::Schema.define(version: 20190204115450) do
     t.index ["email"], name: "index_users_on_email_trigram", using: :gin, opclasses: {"email"=>"gin_trgm_ops"}
     t.index ["feed_token"], name: "index_users_on_feed_token", using: :btree
     t.index ["ghost"], name: "index_users_on_ghost", using: :btree
+    t.index ["group_view"], name: "index_users_on_group_view", using: :btree
     t.index ["incoming_email_token"], name: "index_users_on_incoming_email_token", using: :btree
     t.index ["name"], name: "index_users_on_name", using: :btree
     t.index ["name"], name: "index_users_on_name_trigram", using: :gin, opclasses: {"name"=>"gin_trgm_ops"}

ee/db/migrate/20190130164903_add_group_view_index_to_users.rb

+# frozen_string_literal: true
+
+class AddGroupViewIndexToUsers < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :users, :group_view
+  end
+
+  def down
+    remove_concurrent_index :users, :group_view
+  end
+end