Speed-up stock_current by improving products_resolved and creating indices.

migrations/0106.sql

@@ -0,0 +1,31 @@
+DROP INDEX IF EXISTS _index_products_parents;
+DROP INDEX IF EXISTS _index_stock_products_amount;
+
+CREATE INDEX _index_products_parents ON products (parent_product_id);
+CREATE INDEX _index_stock_products_amount ON stock (product_id, open, best_before_date, amount);
+
+
+DROP INDEX IF EXISTS _index_product_parents_2;
+CREATE INDEX _index_product_parents_2
+    ON products (
+                 /* see products_resolved */
+                 CASE WHEN parent_product_id IS NULL THEN id ELSE parent_product_id END,
+                 active
+        );
+
+/*
+Old version is in 0103.sql
+*/
+DROP VIEW products_resolved;
+CREATE VIEW products_resolved
+AS
+SELECT CASE
+           WHEN p.parent_product_id IS NULL
+               THEN p.id
+           ELSE
+               p.parent_product_id
+           END
+            AS parent_product_id,
+       p.id as sub_product_id
+FROM products p WHERE active = 1;
+