AC-9755:Set default collation to utf8mb4 for MySQL

Author: glo71317

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

@@ -1267,7 +1267,7 @@ public function modifyColumn($tableName, $columnName, $definition, $flushData =
         if (is_array($definition)) {
             $definition = $this->_getColumnDefinition($definition);
         }
-        // Add charset and collation for DBC failures
+        // Set default collation to utf8mb4 for MySQL
         if (!empty($definition)) {
             $type = explode(' ', trim($definition));
             $definition = $this->setDefaultCharsetAndCollation($type[0], $definition, 1);
@@ -2446,7 +2446,7 @@ protected function _getColumnsDefinition(Table $table)
                 $columnDefinition
             );
         }
-        // Adding charset and collation for DBC failures
+        // Set default collation to utf8mb4 for MySQL
         if (count($definition)) {
             foreach ($definition as $index => $columnDefinition) {
                 $type = explode(' ', trim($columnDefinition));
@@ -4309,7 +4309,7 @@ public function __debugInfo()
     }
 
     /***
-     * Set default collation & charset (e.g.,utf8mb4_general_ci & utf8mb4) for tables
+     * Set default collation & charset (e.g.utf8mb4_general_ci and utf8mb4) for tables
      *
      * @param string $columnType
      * @param string $definition

lib/internal/Magento/Framework/Setup/Declaration/Schema/Db/MySQL/DbSchemaWriter.php

@@ -482,8 +482,8 @@ private function getPreparedStatements(array $statementBank) : array
         return $result;
     }
 
-    /***
-     * Set default collation & charset (e.g.,utf8mb4_general_ci & utf8mb4) for tables
+    /**
+     * Set default collation & charset (e.g. utf8mb4_general_ci and utf8mb4) for tables
      *
      * @param string $columnDefinition
      * @return string
@@ -498,7 +498,7 @@ private function setDefaultCharsetAndCollation(string $columnDefinition): string
         return implode(" ", $columnsAttribute);
     }
 
-    /***
+    /**
      * Checks if any column of type varchar,char or text (mediumtext/longtext)
      *
      * @param string $definition

setup/src/Magento/Setup/Model/Installer.php

@@ -660,7 +660,7 @@ private function setupModuleRegistry(SchemaSetupInterface $setup)
                 )->setComment('Module versions registry');
             $connection->createTable($table);
         } else {
-            // change the charset to utf8mb4
+            // Set default collation to utf8mb4 for MySQL
             $getTableSchema = $connection->getCreateTable($setup->getTable('setup_module')) ?? '';
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $tableName = $setup->getTable('setup_module');
@@ -729,7 +729,7 @@ private function setupSessionTable(
             );
             $connection->createTable($table);
         } else {
-            // change the charset to utf8mb4
+            // Set default collation to utf8mb4 for MySQL
             $getTableSchema = $connection->getCreateTable($setup->getTable('session')) ?? '';
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $tableName = $setup->getTable('session');
@@ -837,7 +837,7 @@ private function setupCacheTagTable(
             );
             $connection->createTable($table);
         } else {
-            // change the charset to utf8mb4
+            // Set default collation to utf8mb4 for MySQL
             $getTableSchema = $connection->getCreateTable($setup->getTable('cache_tag')) ?? '';
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $tableName = $setup->getTable('cache_tag');
@@ -1884,7 +1884,7 @@ private function reindexAll(): void
     }
 
     /**
-     * Set default collation & charset (e.g.,utf8mb4_general_ci & utf8mb4) for core setup tables
+     * Set default collation & charset (e.g. utf8mb4_general_ci and utf8mb4) for core setup tables
      *
      * @param string $tableName
      * @param array $columns