spree/spree — pull request #3456 by balexand (2013-07-30 16:56:20+00:00)
Title: index spree_orders#completed_at

An index on this column is probably a good idea. First, the `Order.complete` and `Order.incomplete` scopes query on this column. Also, by default in the admin orders index the orders are both filtered and sorted by this column.