*** src/backend/commands/vacuum.c	2007-02-16 04:53:22.000000000 +0530
--- src/backend/commands/vacuum.c	2007-03-08 09:25:15.016991272 +0530
***************
*** 718,724 ****
--- 718,732 ----
  	 * If anything changed, write out the tuple
  	 */
  	if (dirty)
+ 	{
  		heap_inplace_update(rd, ctup);
+ 		/* the above sends a cache inval message */
+ 	}
+ 	else
+ 	{
+ 		/* no need to change tuple, but force relcache inval anyway */
+ 		CacheInvalidateRelcacheByTuple(ctup);
+ 	}
  
  	heap_close(rd, RowExclusiveLock);
  }