Added global variable to have RI triggers override

time qualification of HeapTupleSatisfiesSnapshot()

Jan

Author: Jan Wieck

src/backend/commands/trigger.c

@@ -24,6 +24,7 @@
 #include "utils/builtins.h"
 #include "utils/inval.h"
 #include "utils/syscache.h"
+#include "utils/tqual.h"
 
 DLLIMPORT TriggerData *CurrentTriggerData = NULL;
 
@@ -1151,6 +1152,13 @@ deferredTriggerExecute(DeferredTriggerEvent event, int itemno)
 	if (rettuple != NULL && rettuple != &oldtuple && rettuple != &newtuple)
 		pfree(rettuple);
 
+	/* ----------
+	 * Might have been a referential integrity constraint trigger.
+	 * Reset the snapshot overriding flag.
+	 * ----------
+	 */
+	ReferentialIntegritySnapshotOverride = false;
+
 	/* ----------
 	 * Release buffers and close the relation
 	 * ----------

src/backend/utils/adt/ri_triggers.c

@@ -6,7 +6,7 @@
  *
  *	1999 Jan Wieck
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.9 1999/12/08 20:41:22 wieck Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.10 1999/12/10 12:34:13 wieck Exp $
  *
  * ----------
  */
@@ -163,6 +163,7 @@ RI_FKey_check (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -489,6 +490,7 @@ RI_FKey_cascade_del (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -686,6 +688,7 @@ RI_FKey_cascade_upd (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -911,6 +914,7 @@ RI_FKey_restrict_del (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -1118,6 +1122,7 @@ RI_FKey_restrict_upd (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -1333,6 +1338,7 @@ RI_FKey_setnull_del (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -1540,6 +1546,7 @@ RI_FKey_setnull_upd (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -1758,6 +1765,7 @@ RI_FKey_setdefault_del (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.
@@ -2005,6 +2013,7 @@ RI_FKey_setdefault_upd (FmgrInfo *proinfo)
 
 	trigdata = CurrentTriggerData;
 	CurrentTriggerData	= NULL;
+	ReferentialIntegritySnapshotOverride = true;
 
 	/* ----------
 	 * Check that this is a valid trigger call on the right time and event.

src/backend/utils/time/tqual.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.32 1999/10/06 21:58:11 vadim Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.33 1999/12/10 12:34:14 wieck Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -24,6 +24,8 @@ Snapshot	SnapshotDirty = &SnapshotDirtyData;
 Snapshot	QuerySnapshot = NULL;
 Snapshot	SerializableSnapshot = NULL;
 
+bool		ReferentialIntegritySnapshotOverride = false;
+
 /*
  * XXX Transaction system override hacks start here
  */
@@ -493,6 +495,9 @@ HeapTupleSatisfiesSnapshot(HeapTupleHeader tuple, Snapshot snapshot)
 	if (AMI_OVERRIDE)
 		return true;
 
+	if (ReferentialIntegritySnapshotOverride)
+		return HeapTupleSatisfiesNow(tuple);
+
 	if (!(tuple->t_infomask & HEAP_XMIN_COMMITTED))
 	{
 		if (tuple->t_infomask & HEAP_XMIN_INVALID)
@@ -606,6 +611,9 @@ void
 SetQuerySnapshot(void)
 {
 
+	/* Initialize snapshot overriding to false */
+	ReferentialIntegritySnapshotOverride = false;
+
 	/* 1st call in xaction */
 	if (SerializableSnapshot == NULL)
 	{

src/include/utils/tqual.h

@@ -7,7 +7,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: tqual.h,v 1.25 1999/09/29 16:06:28 wieck Exp $
+ * $Id: tqual.h,v 1.26 1999/12/10 12:34:15 wieck Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -36,6 +36,8 @@ extern Snapshot SnapshotDirty;
 extern Snapshot QuerySnapshot;
 extern Snapshot SerializableSnapshot;
 
+extern bool ReferentialIntegritySnapshotOverride;
+
 #define IsSnapshotNow(snapshot)		((Snapshot) snapshot == SnapshotNow)
 #define IsSnapshotSelf(snapshot)	((Snapshot) snapshot == SnapshotSelf)
 #define IsSnapshotAny(snapshot)		((Snapshot) snapshot == SnapshotAny)