Removed unused use statement

lib/Doctrine/DBAL/Platforms/MySqlPlatform.php

@@ -26,7 +26,6 @@ use Doctrine\DBAL\Schema\Table;
 use Doctrine\DBAL\Schema\TableDiff;
 use Doctrine\DBAL\Types\BlobType;
 use Doctrine\DBAL\Types\TextType;
-use Doctrine\DBAL\Types\Type;
 
 /**
  * The MySqlPlatform provides the behavior, features and SQL dialect of the
@@ -460,27 +459,15 @@ class MySqlPlatform extends AbstractPlatform
         return $sql;
     }
 
-    /**
-     * Tells whether a field type supports declaration of a default value.
-     *
-     * MySQL (as of 5.7.19) does not support default values for Blob and Text
-     * columns while MariaDB 10.2.1 does.
-     */
-    protected function isDefaultValueSupportedForType(Type $field) : bool
-    {
-        return ! $field instanceof TextType && ! $field instanceof BlobType;
-    }
-
     /**
      * {@inheritdoc}
      */
     public function getDefaultValueDeclarationSQL($field)
     {
-        // Unset the default value if the given field type does not allow default values.
-        if (! $this->isDefaultValueSupportedForType($field['type'])) {
+        // Unset the default value if the given field definition does not allow default values.
+        if ($field['type'] instanceof TextType || $field['type'] instanceof BlobType) {
             $field['default'] = null;
         }
-
         return parent::getDefaultValueDeclarationSQL($field);
     }