Rework the logic of handling TEXT default value for Oracle MySQL

src/Platforms/AbstractMySQLPlatform.php

@@ -13,8 +13,6 @@
 use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Schema\TableDiff;
 use Doctrine\DBAL\TransactionIsolationLevel;
-use Doctrine\DBAL\Types\BlobType;
-use Doctrine\DBAL\Types\TextType;
 
 use function array_merge;
 use function array_unique;
@@ -271,19 +269,6 @@ protected function _getCreateTableSQL(string $name, array $columns, array $optio
         return $sql;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getDefaultValueDeclarationSQL(array $column): string
-    {
-        // Unset the default value if the given column definition does not allow default values.
-        if ($column['type'] instanceof TextType || $column['type'] instanceof BlobType) {
-            $column['default'] = null;
-        }
-
-        return parent::getDefaultValueDeclarationSQL($column);
-    }
-
     /**
      * Build SQL for table options
      *

src/Platforms/MariaDBPlatform.php

@@ -19,17 +19,6 @@
  */
 class MariaDBPlatform extends AbstractMySQLPlatform
 {
-    /**
-     * {@inheritDoc}
-     *
-     * Hop over the {@see AbstractMySQLPlatform} implementation until 4.0.x
-     * where {@see MariaDBPlatform} no longer extends {@see MySQLPlatform}.
-     */
-    public function getDefaultValueDeclarationSQL(array $column): string
-    {
-        return AbstractPlatform::getDefaultValueDeclarationSQL($column);
-    }
-
     /**
      * {@inheritdoc}
      *

src/Platforms/MySQLPlatform.php

@@ -7,13 +7,31 @@
 use Doctrine\DBAL\Platforms\Keywords\KeywordList;
 use Doctrine\DBAL\Platforms\Keywords\MySQLKeywords;
 use Doctrine\DBAL\Schema\Index;
+use Doctrine\DBAL\Types\BlobType;
+use Doctrine\DBAL\Types\TextType;
 
 /**
  * Provides the behavior, features and SQL dialect of the Oracle MySQL database platform
  * of the oldest supported version.
  */
 class MySQLPlatform extends AbstractMySQLPlatform
 {
+    /**
+     * {@inheritDoc}
+     *
+     * Oracle MySQL does not support default values on TEXT/BLOB columns until 8.0.13.
+     *
+     * @link https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-13.html#mysqld-8-0-13-data-types
+     */
+    public function getDefaultValueDeclarationSQL(array $column): string
+    {
+        if ($column['type'] instanceof TextType || $column['type'] instanceof BlobType) {
+            unset($column['default']);
+        }
+
+        return parent::getDefaultValueDeclarationSQL($column);
+    }
+
     public function hasNativeJsonType(): bool
     {
         return true;