woocommerce/plugins/woocommerce-admin/includes/wc-admin-update-functions.php

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<?php
/**
* WooCommerce Admin Updates
*
* Functions for updating data, used by the background updater.
*
* @package WooCommerce/Admin
*/
use \Automattic\WooCommerce\Admin\Install as Installer;
/**
* Update order stats `status` index length.
* See: https://github.com/woocommerce/woocommerce-admin/issues/2969.
*/
function wc_admin_update_0201_order_status_index() {
global $wpdb;
// Max DB index length. See wp_get_db_schema().
$max_index_length = 191;
$index = $wpdb->get_row( "SHOW INDEX FROM {$wpdb->prefix}wc_order_stats WHERE key_name = 'status'" );
if ( property_exists( $index, 'Sub_part' ) ) {
// The index was created with the right length. Time to bail.
if ( $max_index_length === $index->Sub_part ) { // phpcs:ignore WordPress.NamingConventions.ValidVariableName
return;
}
// We need to drop the index so it can be recreated.
$wpdb->query( "DROP INDEX `status` ON {$wpdb->prefix}wc_order_stats" );
}
// Recreate the status index with a max length.
$wpdb->query( $wpdb->prepare( "ALTER TABLE {$wpdb->prefix}wc_order_stats ADD INDEX status (status(%d))", $max_index_length ) );
}
/**
* Update DB Version.
*/
function wc_admin_update_0201_db_version() {
Installer::update_db_version( '0.20.1' );
}