Add mention that tid perhaps someday should be output as a record.

src/backend/utils/adt/tid.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/tid.c,v 1.50 2006/02/26 18:36:21 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/tid.c,v 1.51 2006/02/27 01:41:16 momjian Exp $
  *
  * NOTES
  *	  input routine largely stolen from boxin().
@@ -111,6 +111,7 @@ tidout(PG_FUNCTION_ARGS)
 	blockNumber = BlockIdGetBlockNumber(blockId);
 	offsetNumber = itemPtr->ip_posid;
 
+	/* Perhaps someday we should output this as a record. */
 	snprintf(buf, sizeof(buf), "(%u,%u)", blockNumber, offsetNumber);
 
 	PG_RETURN_CSTRING(pstrdup(buf));