New HeapTuple structure/interface.

src/include/access/heapam.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: heapam.h,v 1.38 1998/10/08 18:30:22 momjian Exp $
+ * $Id: heapam.h,v 1.39 1998/11/27 19:33:31 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -89,6 +89,10 @@ typedef HeapAccessStatisticsData *HeapAccessStatistics;
  *
  * ----------------
  */
+
+extern Datum nocachegetattr(HeapTuple tup, int attnum,
+			   TupleDesc att, bool *isnull);
+
 #if !defined(DISABLE_COMPLEX_MACRO)
 
 #define fastgetattr(tup, attnum, tupleDesc, isnull) \
@@ -101,7 +105,7 @@ typedef HeapAccessStatisticsData *HeapAccessStatistics;
 		 (attnum) == 1) ? \
 		( \
 			(Datum)fetchatt(&((tupleDesc)->attrs[(attnum)-1]), \
-				(char *) (tup) + (tup)->t_hoff + \
+				(char *) (tup)->t_data + (tup)->t_data->t_hoff + \
 				( \
 					((attnum) != 1) ? \
 						(tupleDesc)->attrs[(attnum)-1]->attcacheoff \
@@ -115,7 +119,7 @@ typedef HeapAccessStatisticsData *HeapAccessStatistics;
 	) \
 	: \
 	( \
-		att_isnull((attnum)-1, (tup)->t_bits) ? \
+		att_isnull((attnum)-1, (tup)->t_data->t_bits) ? \
 		( \
 			((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
 			(Datum)NULL \
@@ -129,9 +133,6 @@ typedef HeapAccessStatisticsData *HeapAccessStatistics;
 
 #else							/* !defined(DISABLE_COMPLEX_MACRO) */
 
-extern Datum nocachegetattr(HeapTuple tup, int attnum,
-			   TupleDesc att, bool *isnull);
-
 static Datum
 fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
 			bool *isnull)
@@ -146,7 +147,7 @@ fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
 			   (attnum) == 1) ?
 			  (
 			   (Datum) fetchatt(&((tupleDesc)->attrs[(attnum) - 1]),
-								(char *) (tup) + (tup)->t_hoff +
+								(char *) (tup)->t_data + (tup)->t_data->t_hoff +
 								(
 								 ((attnum) != 1) ?
 							(tupleDesc)->attrs[(attnum) - 1]->attcacheoff
@@ -160,7 +161,7 @@ fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
 			  )
 			 :
 			 (
-			  att_isnull((attnum) - 1, (tup)->t_bits) ?
+			  att_isnull((attnum) - 1, (tup)->t_data->t_bits) ?
 			  (
 			   ((isnull) ? (*(isnull) = true) : (dummyret) NULL),
 			   (Datum) NULL
@@ -205,7 +206,7 @@ fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
 	AssertMacro((tup) != NULL && \
 		(attnum) > FirstLowInvalidHeapAttributeNumber && \
 		(attnum) != 0), \
-	((attnum) > (int) (tup)->t_natts) ? \
+	((attnum) > (int) (tup)->t_data->t_natts) ? \
 	( \
 		((isnull) ? (*(isnull) = true) : (dummyret)NULL), \
 		(Datum)NULL \
@@ -221,13 +222,12 @@ fastgetattr(HeapTuple tup, int attnum, TupleDesc tupleDesc,
 			((isnull) ? (*(isnull) = false) : (dummyret)NULL), \
 			((attnum) == SelfItemPointerAttributeNumber) ? \
 			( \
-				(Datum)((char *)(tup) + \
-					heap_sysoffset[-SelfItemPointerAttributeNumber-1]) \
+				(Datum)((char *)&((tup)->t_self)) \
 			) \
 			: \
 			( \
 				(Datum)*(unsigned int *) \
-					((char *)(tup) + heap_sysoffset[-(attnum)-1]) \
+					((char *)(tup)->t_data + heap_sysoffset[-(attnum)-1]) \
 			) \
 		) \
 	) \
@@ -251,7 +251,7 @@ extern HeapScanDesc heap_beginscan(Relation relation, int atend,
 extern void heap_rescan(HeapScanDesc scan, bool scanFromEnd, ScanKey key);
 extern void heap_endscan(HeapScanDesc scan);
 extern HeapTuple heap_getnext(HeapScanDesc scandesc, int backw);
-extern HeapTuple heap_fetch(Relation relation, Snapshot snapshot, ItemPointer tid, Buffer *userbuf);
+extern void heap_fetch(Relation relation, Snapshot snapshot, HeapTuple tup, Buffer *userbuf);
 extern Oid	heap_insert(Relation relation, HeapTuple tup);
 extern int	heap_delete(Relation relation, ItemPointer tid);
 extern int heap_replace(Relation relation, ItemPointer otid,
@@ -270,6 +270,7 @@ extern bool heap_sysattrbyval(AttrNumber attno);
 extern Datum nocachegetattr(HeapTuple tup, int attnum,
 			   TupleDesc att, bool *isnull);
 extern HeapTuple heap_copytuple(HeapTuple tuple);
+extern void heap_copytuple_with_tuple(HeapTuple src, HeapTuple dest);
 extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor,
 			   Datum *value, char *nulls);
 extern HeapTuple heap_modifytuple(HeapTuple tuple,

src/include/access/htup.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: htup.h,v 1.10 1998/09/01 04:34:14 momjian Exp $
+ * $Id: htup.h,v 1.11 1998/11/27 19:33:31 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -26,10 +26,8 @@
  * to avoid wasting space, the attributes should be layed out in such a
  * way to reduce structure padding.
  */
-typedef struct HeapTupleData
+typedef struct HeapTupleHeaderData
 {
-	unsigned int t_len;			/* length of entire tuple */
-
 	Oid			t_oid;			/* OID of this tuple -- 4 bytes */
 
 	CommandId	t_cmin;			/* insert CID stamp -- 4 bytes each */
@@ -38,7 +36,7 @@ typedef struct HeapTupleData
 	TransactionId t_xmin;		/* insert XID stamp -- 4 bytes each */
 	TransactionId t_xmax;		/* delete XID stamp */
 
-	ItemPointerData t_ctid;		/* current TID of this tuple */
+	ItemPointerData t_ctid;		/* current TID of this or newer tuple */
 
 	int16		t_natts;		/* number of attributes */
 
@@ -50,10 +48,9 @@ typedef struct HeapTupleData
 	/* bit map of domains */
 
 	/* MORE DATA FOLLOWS AT END OF STRUCT */
-} HeapTupleData;
-
-typedef HeapTupleData *HeapTuple;
+} HeapTupleHeaderData;
 
+typedef HeapTupleHeaderData *HeapTupleHeader;
 
 #define SelfItemPointerAttributeNumber			(-1)
 #define ObjectIdAttributeNumber					(-2)
@@ -66,11 +63,33 @@ typedef HeapTupleData *HeapTuple;
 /* If you make any changes above, the order off offsets in this must change */
 extern long heap_sysoffset[];
 
+/*
+ * This new HeapTuple for version >= 6.5 and this is why it was changed:
+ *
+ * 1. t_len moved off on-disk tuple data - ItemIdData is used to get len;
+ * 2. t_ctid above is not self tuple TID now - it may point to
+ *    updated version of tuple (required by MVCC);
+ * 3. someday someone let tuple to cross block boundaries - 
+ *    he have to add something below...
+ */
+typedef struct HeapTupleData
+{
+	uint32				t_len;		/* length of *t_data */
+	ItemPointerData		t_self;		/* SelfItemPointer */
+	HeapTupleHeader		t_data;		/* */
+} HeapTupleData;
+	
+typedef HeapTupleData *HeapTuple;
+
+#define	HEAPTUPLESIZE	DOUBLEALIGN(sizeof(HeapTupleData))
+ 
+ 
 /* ----------------
  *		support macros
  * ----------------
  */
-#define GETSTRUCT(TUP) (((char *)(TUP)) + ((HeapTuple)(TUP))->t_hoff)
+#define GETSTRUCT(TUP) (((char *)((HeapTuple)(TUP))->t_data) + \
+						((HeapTuple)(TUP))->t_data->t_hoff)
 
 
 /*
@@ -101,9 +120,9 @@ extern long heap_sysoffset[];
 #define HEAP_XACT_MASK			0x0F00	/* */
 
 #define HeapTupleNoNulls(tuple) \
-		(!(((HeapTuple) (tuple))->t_infomask & HEAP_HASNULL))
+		(!(((HeapTuple) (tuple))->t_data->t_infomask & HEAP_HASNULL))
 
 #define HeapTupleAllFixed(tuple) \
-		(!(((HeapTuple) (tuple))->t_infomask & HEAP_HASVARLENA))
+		(!(((HeapTuple) (tuple))->t_data->t_infomask & HEAP_HASVARLENA))
 
 #endif	 /* HTUP_H */

src/include/access/relscan.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: relscan.h,v 1.12 1998/09/01 04:34:23 momjian Exp $
+ * $Id: relscan.h,v 1.13 1998/11/27 19:33:31 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -23,9 +23,9 @@ typedef ItemPointerData MarkData;
 typedef struct HeapScanDescData
 {
 	Relation		rs_rd;			/* pointer to relation descriptor */
-	HeapTuple	rs_ptup;		/* previous tuple in scan */
-	HeapTuple	rs_ctup;		/* current tuple in scan */
-	HeapTuple	rs_ntup;		/* next tuple in scan */
+	HeapTupleData	rs_ptup;		/* previous tuple in scan */
+	HeapTupleData	rs_ctup;		/* current tuple in scan */
+	HeapTupleData	rs_ntup;		/* next tuple in scan */
 	Buffer			rs_pbuf;		/* previous buffer in scan */
 	Buffer			rs_cbuf;		/* current buffer in scan */
 	Buffer			rs_nbuf;		/* next buffer in scan */
@@ -50,7 +50,7 @@ typedef struct IndexScanDescData
 	ItemPointerData currentItemData;	/* current index pointer */
 	ItemPointerData nextItemData;		/* next index pointer */
 	MarkData	previousMarkData;		/* marked previous pointer */
-	MarkData	currentMarkData;/* marked current  pointer */
+	MarkData	currentMarkData;		/* marked current  pointer */
 	MarkData	nextMarkData;			/* marked next pointer */
 	uint8		flags;					/* scan position flags */
 	bool		scanFromEnd;			/* restart scan at end? */

src/include/access/valid.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: valid.h,v 1.15 1998/09/01 04:34:33 momjian Exp $
+ * $Id: valid.h,v 1.16 1998/11/27 19:33:32 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -109,48 +109,40 @@ do \
  *	with joey's expensive function work.
  * ----------------
  */
-#define HeapTupleSatisfies(itemId, \
+#define HeapTupleSatisfies(tuple, \
 						   relation, \
 						   buffer, \
 						   disk_page, \
 						   seeself, \
 						   nKeys, \
-						   key, \
-						   result) \
+						   key) \
 do \
 { \
 /* We use underscores to protect the variable passed in as parameters */ \
-	HeapTuple	_tuple; \
 	bool		_res; \
- \
-	if (!ItemIdIsUsed(itemId)) \
-		(result) = (HeapTuple) NULL; \
-	else \
-	{ \
-		_tuple = (HeapTuple) PageGetItem((Page) (disk_page), (itemId)); \
  \
 	if ((key) != NULL) \
-			HeapKeyTest(_tuple, RelationGetDescr(relation), \
+		HeapKeyTest(tuple, RelationGetDescr(relation), \
 						   (nKeys), (key), _res); \
 	else \
 		_res = TRUE; \
  \
-		(result) = (HeapTuple) NULL; \
 	if (_res) \
 	{ \
-			if ((relation)->rd_rel->relkind == RELKIND_UNCATALOGED) \
-				(result) = _tuple; \
-			else \
+		if ((relation)->rd_rel->relkind != RELKIND_UNCATALOGED) \
 		{ \
-				uint16	_infomask = _tuple->t_infomask; \
+			uint16	_infomask = (tuple)->t_data->t_infomask; \
 			\
-				_res = HeapTupleSatisfiesVisibility(_tuple, (seeself)); \
-				if (_tuple->t_infomask != _infomask) \
+			_res = HeapTupleSatisfiesVisibility((tuple), (seeself)); \
+			if ((tuple)->t_data->t_infomask != _infomask) \
 				SetBufferCommitInfoNeedsSave(buffer); \
-				if (_res) \
-					(result) = _tuple; \
+			if (!_res) \
+				(tuple)->t_data = NULL; \
 		} \
 	} \
+	else \
+	{ \
+		(tuple)->t_data = NULL; \
 	} \
 } while (0)
 

src/include/executor/executor.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: executor.h,v 1.27 1998/10/14 05:10:05 momjian Exp $
+ * $Id: executor.h,v 1.28 1998/11/27 19:33:32 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -85,7 +85,7 @@ extern HeapTuple ExecRemoveJunk(JunkFilter *junkfilter, TupleTableSlot *slot);
 extern TupleDesc ExecutorStart(QueryDesc *queryDesc, EState *estate);
 extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count);
 extern void ExecutorEnd(QueryDesc *queryDesc, EState *estate);
-extern HeapTuple ExecConstraints(char *caller, Relation rel, HeapTuple tuple);
+extern void ExecConstraints(char *caller, Relation rel, HeapTuple tuple);
 #ifdef QUERY_LIMIT
 extern int ExecutorLimit(int limit);
 extern int ExecutorGetLimit(void);

src/include/executor/tuptable.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: tuptable.h,v 1.8 1998/09/01 04:36:13 momjian Exp $
+ * $Id: tuptable.h,v 1.9 1998/11/27 19:33:33 vadim Exp $
  *
  * NOTES
  *	  The tuple table interface is getting pretty ugly.

src/include/nodes/execnodes.h

@@ -6,7 +6,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: execnodes.h,v 1.18 1998/09/01 04:36:35 momjian Exp $
+ * $Id: execnodes.h,v 1.19 1998/11/27 19:33:33 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -405,6 +405,7 @@ typedef struct IndexScanState
 	Pointer				iss_RuntimeKeyInfo;
 	RelationPtr			iss_RelationDescs;
 	IndexScanDescPtr	iss_ScanDescs;
+	HeapTupleData		iss_htup;
 } IndexScanState;
 
 

src/include/utils/tqual.h

@@ -7,7 +7,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: tqual.h,v 1.14 1998/09/01 04:39:35 momjian Exp $
+ * $Id: tqual.h,v 1.15 1998/11/27 19:33:35 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -42,14 +42,14 @@ extern CommandId HeapSpecialCommandId;
  */
 #define HeapTupleSatisfiesVisibility(tuple, snapshot) \
 ( \
-	TransactionIdEquals((tuple)->t_xmax, AmiTransactionId) ? \
+	TransactionIdEquals((tuple)->t_data->t_xmax, AmiTransactionId) ? \
 		false \
 	: \
 	( \
 		(IsSnapshotSelf(snapshot) || heapisoverride()) ? \
-			HeapTupleSatisfiesItself(tuple) \
+			HeapTupleSatisfiesItself((tuple)->t_data) \
 		: \
-			HeapTupleSatisfiesNow(tuple) \
+			HeapTupleSatisfiesNow((tuple)->t_data) \
 	) \
 )
 
@@ -71,8 +71,8 @@ extern CommandId HeapSpecialCommandId;
 	) \
 )
 
-extern bool HeapTupleSatisfiesItself(HeapTuple tuple);
-extern bool HeapTupleSatisfiesNow(HeapTuple tuple);
+extern bool HeapTupleSatisfiesItself(HeapTupleHeader tuple);
+extern bool HeapTupleSatisfiesNow(HeapTupleHeader tuple);
 
 extern void setheapoverride(bool on);