Use Snapshot in heap access methods.

src/backend/executor/execAmi.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execAmi.c,v 1.23 1998/07/16 01:49:18 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execAmi.c,v 1.24 1998/07/27 19:37:54 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -56,7 +56,7 @@
 
 static Pointer
 ExecBeginScan(Relation relation, int nkeys, ScanKey skeys,
-			  bool isindex, ScanDirection dir);
+			  bool isindex, ScanDirection dir, Snapshot snapshot);
 static Relation ExecOpenR(Oid relationOid, bool isindex);
 
 /* ----------------------------------------------------------------
@@ -81,6 +81,7 @@ ExecOpenScanR(Oid relOid,
 			  ScanKey skeys,
 			  bool isindex,
 			  ScanDirection dir,
+			  Snapshot snapshot,
 			  Relation *returnRelation, /* return */
 			  Pointer *returnScanDesc)	/* return */
 {
@@ -99,7 +100,8 @@ ExecOpenScanR(Oid relOid,
 							 nkeys,
 							 skeys,
 							 isindex,
-							 dir);
+							 dir,
+							 snapshot);
 
 	if (returnRelation != NULL)
 		*returnRelation = relation;
@@ -153,7 +155,8 @@ ExecBeginScan(Relation relation,
 			  int nkeys,
 			  ScanKey skeys,
 			  bool isindex,
-			  ScanDirection dir)
+			  ScanDirection dir,
+			  Snapshot snapshot)
 {
 	Pointer		scanDesc;
 
@@ -178,7 +181,7 @@ ExecBeginScan(Relation relation,
 	{
 		scanDesc = (Pointer) heap_beginscan(relation,
 											ScanDirectionIsBackward(dir),
-											false,
+											snapshot,
 											nkeys,
 											skeys);
 	}

src/backend/executor/execMain.c

@@ -26,7 +26,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.50 1998/07/20 16:14:13 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.51 1998/07/27 19:37:55 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -124,6 +124,8 @@ ExecutorStart(QueryDesc *queryDesc, EState *estate)
 			palloc(queryDesc->plantree->nParamExec * sizeof(ParamExecData));
 		memset(estate->es_param_exec_vals, 0, queryDesc->plantree->nParamExec * sizeof(ParamExecData));
 	}
+	
+	estate->es_snapshot = SnapshotNow;
 
 	result = InitPlan(queryDesc->operation,
 					  queryDesc->parsetree,

src/backend/executor/execUtils.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.33 1998/07/20 16:14:13 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/execUtils.c,v 1.34 1998/07/27 19:37:56 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -750,7 +750,7 @@ ExecOpenIndices(Oid resultRelationOid,
 	 */
 	indexSd = heap_beginscan(indexRd,	/* scan desc */
 							 false,		/* scan backward flag */
-							 false,		/* see self */
+							 SnapshotNow,	/* NOW snapshot */
 							 1, /* number scan keys */
 							 &key);		/* scan keys */
 

src/backend/executor/nodeIndexscan.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.18 1998/06/15 19:28:22 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeIndexscan.c,v 1.19 1998/07/27 19:37:57 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -85,7 +85,8 @@ IndexNext(IndexScan *node)
 	EState	   *estate;
 	CommonScanState *scanstate;
 	IndexScanState *indexstate;
-	ScanDirection direction;
+	ScanDirection	direction;
+	Snapshot		snapshot;
 	int			indexPtr;
 	IndexScanDescPtr scanDescs;
 	IndexScanDesc scandesc;
@@ -101,6 +102,7 @@ IndexNext(IndexScan *node)
 	 */
 	estate = node->scan.plan.state;
 	direction = estate->es_direction;
+	snapshot = estate->es_snapshot;
 	scanstate = node->scan.scanstate;
 	indexstate = node->indxstate;
 	indexPtr = indexstate->iss_IndexPtr;
@@ -122,7 +124,8 @@ IndexNext(IndexScan *node)
 	 */
 	while ((result = index_getnext(scandesc, direction)) != NULL)
 	{
-		tuple = heap_fetch(heapRelation, false, &result->heap_iptr, &buffer);
+		tuple = heap_fetch(heapRelation, snapshot, 
+							&result->heap_iptr, &buffer);
 		/* be tidy */
 		pfree(result);
 
@@ -920,6 +923,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 				  (ScanKey) NULL,		/* scan key */
 				  0,			/* is index */
 				  direction,	/* scan direction */
+				  estate->es_snapshot,	/* */
 				  &currentRelation,		/* return: rel desc */
 				  (Pointer *) &currentScanDesc);		/* return: scan desc */
 
@@ -958,6 +962,7 @@ ExecInitIndexScan(IndexScan *node, EState *estate, Plan *parent)
 						  scanKeys[i],	/* scan key */
 						  true, /* is index */
 						  direction,	/* scan direction */
+						  estate->es_snapshot,
 						  &(relationDescs[i]),	/* return: rel desc */
 						  (Pointer *) &(scanDescs[i]));
 			/* return: scan desc */

src/backend/executor/nodeMaterial.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeMaterial.c,v 1.13 1998/02/26 04:31:28 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeMaterial.c,v 1.14 1998/07/27 19:37:57 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -139,8 +139,7 @@ ExecMaterial(Material *node)
 		 */
 		currentScanDesc = heap_beginscan(currentRelation,		/* relation */
 										 ScanDirectionIsBackward(dir),
-		/* bkwd flag */
-										 false, /* seeself */
+										 SnapshotSelf,	/* seeself */
 										 0,		/* num scan keys */
 										 NULL); /* scan keys */
 		matstate->csstate.css_currentRelation = currentRelation;

src/backend/executor/nodeSeqscan.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeSeqscan.c,v 1.10 1998/06/15 19:28:22 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeSeqscan.c,v 1.11 1998/07/27 19:37:57 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -181,6 +181,7 @@ InitScanRelation(SeqScan *node, EState *estate,
 					  NULL,		/* scan key */
 					  0,		/* is index */
 					  direction,/* scan direction */
+					  estate->es_snapshot,
 					  &currentRelation, /* return: rel desc */
 					  (Pointer *) &currentScanDesc);	/* return: scan desc */
 

src/backend/executor/nodeTee.c

@@ -15,7 +15,7 @@
  *		ExecEndTee
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/Attic/nodeTee.c,v 1.18 1998/06/15 19:28:23 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/Attic/nodeTee.c,v 1.19 1998/07/27 19:37:57 vadim Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -226,10 +226,11 @@ ExecCountSlotsTee(Tee *node)
 static void
 initTeeScanDescs(Tee *node)
 {
-	TeeState   *teeState;
-	Relation	bufferRel;
-	ScanDirection dir;
-	MemoryContext orig;
+	TeeState	   *teeState;
+	Relation		bufferRel;
+	ScanDirection	dir;
+	Snapshot		snapshot;
+	MemoryContext	orig;
 
 	teeState = node->teestate;
 	if (teeState->tee_leftScanDesc && teeState->tee_rightScanDesc)
@@ -241,23 +242,24 @@ initTeeScanDescs(Tee *node)
 	bufferRel = teeState->tee_bufferRel;
 	dir = ((Plan *) node)->state->es_direction; /* backwards not handled
 												 * yet XXX */
+	snapshot = ((Plan *) node)->state->es_snapshot;
 
 	if (teeState->tee_leftScanDesc == NULL)
 	{
 		teeState->tee_leftScanDesc = heap_beginscan(bufferRel,
 											ScanDirectionIsBackward(dir),
-													false,		/* seeself */
-													0,	/* num scan keys */
-													NULL		/* scan keys */
+											snapshot,
+											0,	/* num scan keys */
+											NULL		/* scan keys */
 			);
 	}
 	if (teeState->tee_rightScanDesc == NULL)
 	{
 		teeState->tee_rightScanDesc = heap_beginscan(bufferRel,
 											ScanDirectionIsBackward(dir),
-													 false,		/* seeself */
-													 0, /* num scan keys */
-													 NULL		/* scan keys */
+											snapshot,
+											0, /* num scan keys */
+											NULL		/* scan keys */
 			);
 	}