*** pgsql/src/backend/utils/adt/quote.c	2008/01/01 19:45:52	1.23
--- pgsql/src/backend/utils/adt/quote.c	2008/03/23 00:24:19	1.24
***************
*** 7,13 ****
   *
   *
   * IDENTIFICATION
!  *	  $PostgreSQL: pgsql/src/backend/utils/adt/quote.c,v 1.22 2007/02/27 23:48:08 tgl Exp $
   *
   *-------------------------------------------------------------------------
   */
--- 7,13 ----
   *
   *
   * IDENTIFICATION
!  *	  $PostgreSQL: pgsql/src/backend/utils/adt/quote.c,v 1.23 2008/01/01 19:45:52 momjian Exp $
   *
   *-------------------------------------------------------------------------
   */
*************** quote_literal(PG_FUNCTION_ARGS)
*** 96,98 ****
--- 96,114 ----
  
  	PG_RETURN_TEXT_P(result);
  }
+ 
+ /*
+  * quote_nullable -
+  *    Returns a properly quoted literal, with null values returned
+  *    as the text string 'NULL'.
+  */
+ Datum
+ quote_nullable(PG_FUNCTION_ARGS)
+ {
+ 	if (PG_ARGISNULL(0))
+ 		PG_RETURN_DATUM(DirectFunctionCall1(textin,
+ 											CStringGetDatum("NULL")));
+ 	else
+ 		PG_RETURN_DATUM(DirectFunctionCall1(quote_literal,
+ 											PG_GETARG_DATUM(0)));
+ }