AC-11995:Add compatibility with MySQL 8.4 LTS for Magento CE

Author: glo17680

lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php

@@ -251,6 +251,13 @@ class Mysql extends \Zend_Db_Adapter_Pdo_Mysql implements AdapterInterface, Rese
      */
     private $parentConnections = [];
 
+    /***
+     * Get exact version of MySQL
+     *
+     * @var string
+     */
+    private $mysqlversion;
+    
     /**
      * Constructor
      *
@@ -3069,9 +3076,8 @@ public function startSetup()
         $this->rawQuery("SET SQL_MODE=''");
         $this->rawQuery("SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0");
         $this->rawQuery("SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO'");
-
-        $version = $this->fetchPairs("SHOW variables LIKE 'version'")['version'] ?? '';
-        if (str_contains($version, '8.4')) {
+        $this->mysqlversion = $this->fetchPairs("SHOW variables LIKE 'version'")['version'] ?? '';
+        if ($this->isMysql8EngineUsed() && str_contains($this->mysqlversion, '8.4')) {
             $this->rawQuery("SET @OLD_RESTRICT_FK_ON_NON_STANDARD_KEY=@@RESTRICT_FK_ON_NON_STANDARD_KEY");
             $this->rawQuery("SET RESTRICT_FK_ON_NON_STANDARD_KEY=0");
         }
@@ -3087,8 +3093,7 @@ public function endSetup()
     {
         $this->rawQuery("SET SQL_MODE=IFNULL(@OLD_SQL_MODE,'')");
         $this->rawQuery("SET FOREIGN_KEY_CHECKS=IF(@OLD_FOREIGN_KEY_CHECKS=0, 0, 1)");
-        $version = $this->fetchPairs("SHOW variables LIKE 'version'")['version'] ?? '';
-        if (str_contains($version, '8.4')) {
+        if ($this->isMysql8EngineUsed() && str_contains($this->mysqlversion, '8.4')) {
             $this->rawQuery("SET RESTRICT_FK_ON_NON_STANDARD_KEY=IF(@OLD_RESTRICT_FK_ON_NON_STANDARD_KEY=0, 0, 1)");
         }
         return $this;