dev/core#2784 Export PRIMARY fields Fails on CiviCRM 5.40.2 and MariaDB 10.3 with row size issue

PR 21239

civicrm/CRM/Export/BAO/ExportProcessor.php

@@ -1469,7 +1469,7 @@ class CRM_Export_BAO_ExportProcessor {
             // @see https://lab.civicrm.org/dev/core/-/issues/2645
             switch ($fieldName) {
               case 'preferred_mail_format':
-                return "`$fieldName` varchar(16)";
+                return "`$fieldName` text(16)";
 
               default:
                 return "`$fieldName` varchar({$fieldSpec['maxlength']})";