Add C comments that HEAP_MOVED_* define usage is only for pre-9.0 binary

upgrades.

src/backend/utils/time/tqual.c

@@ -50,7 +50,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.116 2010/02/08 04:33:54 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.117 2010/02/08 14:10:21 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -91,7 +91,7 @@ static bool XidInMVCCSnapshot(TransactionId xid, Snapshot snapshot);
  * code in heapam.c relies on that!)
  *
  * Also, if we are cleaning up HEAP_MOVED_IN or HEAP_MOVED_OFF entries, then
- * we can always set the hint bits, since old-style VACUUM FULL always used
+ * we can always set the hint bits, since pre-9.0 VACUUM FULL always used
  * synchronous commits and didn't move tuples that weren't previously
  * hinted.  (This is not known by this subroutine, but is applied by its
  * callers.)  Note: old-style VACUUM FULL is gone, but we have to keep this
@@ -167,6 +167,7 @@ HeapTupleSatisfiesSelf(HeapTupleHeader tuple, Snapshot snapshot, Buffer buffer)
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return false;
 
+		/* Used by pre-9.0 binary upgrades */
 		if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -185,6 +186,7 @@ HeapTupleSatisfiesSelf(HeapTupleHeader tuple, Snapshot snapshot, Buffer buffer)
 							InvalidTransactionId);
 			}
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -338,6 +340,7 @@ HeapTupleSatisfiesNow(HeapTupleHeader tuple, Snapshot snapshot, Buffer buffer)
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return false;
 
+		/* Used by pre-9.0 binary upgrades */
 		if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -356,6 +359,7 @@ HeapTupleSatisfiesNow(HeapTupleHeader tuple, Snapshot snapshot, Buffer buffer)
 							InvalidTransactionId);
 			}
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -502,6 +506,7 @@ HeapTupleSatisfiesToast(HeapTupleHeader tuple, Snapshot snapshot,
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return false;
 
+		/* Used by pre-9.0 binary upgrades */
 		if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -520,6 +525,7 @@ HeapTupleSatisfiesToast(HeapTupleHeader tuple, Snapshot snapshot,
 							InvalidTransactionId);
 			}
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -581,6 +587,7 @@ HeapTupleSatisfiesUpdate(HeapTupleHeader tuple, CommandId curcid,
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return HeapTupleInvisible;
 
+		/* Used by pre-9.0 binary upgrades */
 		if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -599,6 +606,7 @@ HeapTupleSatisfiesUpdate(HeapTupleHeader tuple, CommandId curcid,
 							InvalidTransactionId);
 			}
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -748,6 +756,7 @@ HeapTupleSatisfiesDirty(HeapTupleHeader tuple, Snapshot snapshot,
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return false;
 
+		/* Used by pre-9.0 binary upgrades */
 		if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -766,6 +775,7 @@ HeapTupleSatisfiesDirty(HeapTupleHeader tuple, Snapshot snapshot,
 							InvalidTransactionId);
 			}
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -907,6 +917,7 @@ HeapTupleSatisfiesMVCC(HeapTupleHeader tuple, Snapshot snapshot,
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return false;
 
+		/* Used by pre-9.0 binary upgrades */
 		if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -925,6 +936,7 @@ HeapTupleSatisfiesMVCC(HeapTupleHeader tuple, Snapshot snapshot,
 							InvalidTransactionId);
 			}
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -1066,6 +1078,7 @@ HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId OldestXmin,
 	{
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
 			return HEAPTUPLE_DEAD;
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_OFF)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);
@@ -1083,6 +1096,7 @@ HeapTupleSatisfiesVacuum(HeapTupleHeader tuple, TransactionId OldestXmin,
 			SetHintBits(tuple, buffer, HEAP_XMIN_COMMITTED,
 						InvalidTransactionId);
 		}
+		/* Used by pre-9.0 binary upgrades */
 		else if (tuple->t_infomask & HEAP_MOVED_IN)
 		{
 			TransactionId xvac = HeapTupleHeaderGetXvac(tuple);

src/include/access/htup.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/htup.h,v 1.111 2010/02/08 04:33:54 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/htup.h,v 1.112 2010/02/08 14:10:21 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -176,9 +176,11 @@ typedef HeapTupleHeaderData *HeapTupleHeader;
 #define HEAP_XMAX_IS_MULTI		0x1000	/* t_xmax is a MultiXactId */
 #define HEAP_UPDATED			0x2000	/* this is UPDATEd version of row */
 #define HEAP_MOVED_OFF			0x4000	/* moved to another place by
-										 * old-style VACUUM FULL */
+										 * pre-9.0 VACUUM FULL; kept
+										 * for binary upgrade support */
 #define HEAP_MOVED_IN			0x8000	/* moved from another place by
-										 * old-style VACUUM FULL */
+										 * pre-9.0 VACUUM FULL; kept
+										 * for binary upgrade support */
 #define HEAP_MOVED (HEAP_MOVED_OFF | HEAP_MOVED_IN)
 
 #define HEAP_XACT_MASK			0xFFE0	/* visibility-related bits */