From a014bd21c15a7d9eb8622a1be91965700edaae06 Mon Sep 17 00:00:00 2001
From: whyisjake <whyisjake@git.wordpress.org>
Date: Thu, 19 Sep 2019 22:07:57 +0000
Subject: [PATCH] Multisite: Remove the redundant `blog_versions` table.

As part of the Multisite installation process, a `blog_versions` table is created. This table is never read from (except immediately prior to updating it), it's only ever inserted into or updated. It is not used to determine which blogs need to be upgraded.
This table was introduced in 3.0 when the WPMU schema was merged #11644 and it appears the table has never been used in core and is therefore redundant and may as well be removed.

Props johnbillion, nacin, ryan, johnjamesjacoby, whyisjake.

Fixes #19755. See #41685.


Built from https://develop.svn.wordpress.org/trunk@46194


git-svn-id: http://core.svn.wordpress.org/trunk@46006 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/includes/schema.php  | 7 -------
 wp-admin/includes/upgrade.php | 7 -------
 wp-includes/version.php       | 2 +-
 wp-includes/wp-db.php         | 9 ---------
 4 files changed, 1 insertion(+), 24 deletions(-)

diff --git a/wp-admin/includes/schema.php b/wp-admin/includes/schema.php
index dca64b3471..a2e8216457 100644
--- a/wp-admin/includes/schema.php
+++ b/wp-admin/includes/schema.php
@@ -261,13 +261,6 @@ CREATE TABLE $wpdb->posts (
 	KEY domain (domain(50),path(5)),
 	KEY lang_id (lang_id)
 ) $charset_collate;
-CREATE TABLE $wpdb->blog_versions (
-	blog_id bigint(20) NOT NULL default '0',
-	db_version varchar(20) NOT NULL default '',
-	last_updated datetime NOT NULL default '0000-00-00 00:00:00',
-	PRIMARY KEY  (blog_id),
-	KEY db_version (db_version)
-) $charset_collate;
 CREATE TABLE $wpdb->blogmeta (
 	meta_id bigint(20) unsigned NOT NULL auto_increment,
 	blog_id bigint(20) NOT NULL default '0',
diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index d42673f01a..5aa0f12882 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -650,13 +650,6 @@ if ( ! function_exists( 'wp_upgrade' ) ) :
 		wp_cache_flush();
 
 		if ( is_multisite() ) {
-			$site_id = get_current_blog_id();
-
-			if ( $wpdb->get_row( $wpdb->prepare( "SELECT blog_id FROM {$wpdb->blog_versions} WHERE blog_id = %d", $site_id ) ) ) {
-				$wpdb->query( $wpdb->prepare( "UPDATE {$wpdb->blog_versions} SET db_version = %d WHERE blog_id = %d", $wp_db_version, $site_id ) );
-			} else {
-				$wpdb->query( $wpdb->prepare( "INSERT INTO {$wpdb->blog_versions} ( `blog_id` , `db_version` , `last_updated` ) VALUES ( %d, %d, NOW() );", $site_id, $wp_db_version ) );
-			}
 			update_site_meta( get_current_blog_id(), 'db_version', $wp_db_version );
 			update_site_meta( get_current_blog_id(), 'db_last_updated', microtime() );
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a459c4e942..082a9d51c2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46193';
+$wp_version = '5.3-alpha-46194';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index 00f231a303..57471dc2ed 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -306,7 +306,6 @@ class wpdb {
 		'sitemeta',
 		'sitecategories',
 		'registration_log',
-		'blog_versions',
 	);
 
 	/**
@@ -425,14 +424,6 @@ class wpdb {
 	 */
 	public $blogmeta;
 
-	/**
-	 * Multisite Blog Versions table
-	 *
-	 * @since 3.0.0
-	 * @var string
-	 */
-	public $blog_versions;
-
 	/**
 	 * Multisite Registration Log table
 	 *