Add delete to manual execution plans

lib/nose/plans/execution_plan.rb

@@ -241,6 +241,21 @@ def Insert(index_key, *fields)
         @update_steps << step
       end
 
+      # Add a new deletion step from an index
+      def Delete(index_key)
+        @index = @schema.indexes[index_key]
+
+        step = Plans::DeletePlanStep.new @index
+
+        # Get cardinality from last step of each support query plan
+        # as in UpdatePlanner#find_plans_for_update
+        cardinalities = @query_plans.map { |p| p.steps.last.state.cardinality }
+        cardinality = cardinalities.inject(1, &:*)
+        step.state = OpenStruct.new cardinality: cardinality
+
+        @update_steps << step
+      end
+
       # rubocop:enable MethodName
     end
   end

plans/rubis_expert.rb

@@ -168,6 +168,7 @@
       Param  items.id, :==
       Param  items.end_date, :==
       Insert 'items_with_category', items.id, categories.id, items.quantity
+      Delete 'items_by_category'
       Insert 'items_by_category', categories.id, items.end_date, items.id
     end