*** pgsql/src/include/access/gin.h	2010/08/01 02:12:42	1.40
--- pgsql/src/include/access/gin.h	2010/08/01 19:16:39	1.41
***************
*** 4,10 ****
   *
   *	Copyright (c) 2006-2010, PostgreSQL Global Development Group
   *
!  *	$PostgreSQL: pgsql/src/include/access/gin.h,v 1.39 2010/07/31 00:30:54 tgl Exp $
   *--------------------------------------------------------------------------
   */
  #ifndef GIN_H
--- 4,10 ----
   *
   *	Copyright (c) 2006-2010, PostgreSQL Global Development Group
   *
!  *	$PostgreSQL: pgsql/src/include/access/gin.h,v 1.40 2010/08/01 02:12:42 tgl Exp $
   *--------------------------------------------------------------------------
   */
  #ifndef GIN_H
*************** typedef struct GinMetaPageData
*** 107,119 ****
   * We use our own ItemPointerGet(BlockNumber|GetOffsetNumber)
   * to avoid Asserts, since sometimes the ip_posid isn't "valid"
   */
- 
  #define GinItemPointerGetBlockNumber(pointer) \
  	BlockIdGetBlockNumber(&(pointer)->ip_blkid)
  
  #define GinItemPointerGetOffsetNumber(pointer) \
  	((pointer)->ip_posid)
  
  #define ItemPointerSetMin(p)  \
  	ItemPointerSet((p), (BlockNumber)0, (OffsetNumber)0)
  #define ItemPointerIsMin(p)  \
--- 107,128 ----
   * We use our own ItemPointerGet(BlockNumber|GetOffsetNumber)
   * to avoid Asserts, since sometimes the ip_posid isn't "valid"
   */
  #define GinItemPointerGetBlockNumber(pointer) \
  	BlockIdGetBlockNumber(&(pointer)->ip_blkid)
  
  #define GinItemPointerGetOffsetNumber(pointer) \
  	((pointer)->ip_posid)
  
+ /*
+  * Special-case item pointer values needed by the GIN search logic.
+  *	MIN: sorts less than any valid item pointer
+  *	MAX: sorts greater than any valid item pointer
+  *	LOSSY PAGE: indicates a whole heap page, sorts after normal item
+  *				pointers for that page
+  * Note that these are all distinguishable from an "invalid" item pointer
+  * (which is InvalidBlockNumber/0) as well as from all normal item
+  * pointers (which have item numbers in the range 1..MaxHeapTuplesPerPage).
+  */
  #define ItemPointerSetMin(p)  \
  	ItemPointerSet((p), (BlockNumber)0, (OffsetNumber)0)
  #define ItemPointerIsMin(p)  \