From 82c57cd36a800d08ec71ed26d284b58e09c2428a Mon Sep 17 00:00:00 2001
From: Ian Morland <ian@morland.me>
Date: Wed, 13 Jan 2021 19:18:38 +0000
Subject: [PATCH] Add is_sticky, last_posted_at index to improve performance
 (#23)

This PR introduces an additional index [is_sticky, last_posted_at] to the discussions table. We discovered that when viewing discussions in a tag with a large number of discussions (approx 1.4M in our case), performance was poor when using the default sort criteria (sort by latest).
---
 ..._add_discussion_last_posted_at_indices.php | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php

diff --git a/extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php b/extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php
new file mode 100644
index 000000000..a837fdddf
--- /dev/null
+++ b/extensions/sticky/migrations/2021_01_13_000000_add_discussion_last_posted_at_indices.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Schema\Builder;
+
+return [
+    'up' => function (Builder $schema) {
+        $schema->table('discussions', function (Blueprint $table) {
+            $table->index(['is_sticky', 'last_posted_at']);
+        });
+    },
+
+    'down' => function (Builder $schema) {
+        $schema->table('discussions', function (Blueprint $table) {
+            $table->dropIndex(['is_sticky', 'last_posted_at']);
+        });
+    }
+];