sql_class.h:

  New method to simplify access to thd charset

sql/sql_class.h

@@ -677,6 +677,7 @@ class THD :public ilink
     is_fatal_error= 1;
     net.report_error= 1; 
   }
+  inline CHARSET_INFO *charset() { return variables.thd_charset; }
 };
 
 /*