- Fixed a bug occuring when a field was already escaped

src/Adapter/MySQL.php

@@ -130,7 +130,7 @@ class MySQL implements AdapterInterface {
             case static::IDENTIFIER_DATABASE:
             case static::IDENTIFIER_TABLE:
             case static::IDENTIFIER_FIELD:
-                return "`" . str_replace("`", "``", $segment) . "`";
+                return "`" . trim(str_replace("`", "``", $segment), '`') . "`";
 
             case static::IDENTIFIER_VALUE:
                 return "\"$segment\"";