Remove some no-longer-needed kluges for bootstrapping, in particular

the AMI_OVERRIDE flag.  The fact that TransactionLogFetch treats
BootstrapTransactionId as always committed is sufficient to make
bootstrap work, and getting rid of extra tests in heavily used code
paths seems like a win.  The files produced by initdb are demonstrably
the same after this change.

src/backend/access/heap/heapam.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.182 2004/12/31 21:59:16 pgsql Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.183 2005/02/20 21:46:47 tgl Exp $
  *
  *
  * INTERFACE ROUTINES
@@ -715,10 +715,6 @@ heap_beginscan(Relation relation, Snapshot snapshot,
 	 */
 	RelationIncrementReferenceCount(relation);
 
-	/* XXX someday assert SelfTimeQual if relkind == RELKIND_UNCATALOGED */
-	if (relation->rd_rel->relkind == RELKIND_UNCATALOGED)
-		snapshot = SnapshotSelf;
-
 	/*
 	 * allocate and initialize scan descriptor
 	 */

src/backend/access/transam/transam.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/transam/transam.c,v 1.63 2004/12/31 21:59:29 pgsql Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/transam/transam.c,v 1.64 2005/02/20 21:46:48 tgl Exp $
  *
  * NOTES
  *	  This file contains the high level access-method interface to the
@@ -25,18 +25,6 @@
 #include "utils/tqual.h"
 
 
-/* ----------------
- *		Flag indicating that we are bootstrapping.
- *
- * Transaction ID generation is disabled during bootstrap; we just use
- * BootstrapTransactionId.	Also, the transaction ID status-check routines
- * are short-circuited; they claim that BootstrapTransactionId has already
- * committed, allowing tuples already inserted to be seen immediately.
- * ----------------
- */
-bool		AMI_OVERRIDE = false;
-
-
 static XidStatus TransactionLogFetch(TransactionId transactionId);
 static void TransactionLogUpdate(TransactionId transactionId,
 					 XidStatus status);
@@ -134,18 +122,6 @@ TransactionLogMultiUpdate(int nxids, TransactionId *xids, XidStatus status)
 		TransactionIdSetStatus(xids[i], status);
 }
 
-/* --------------------------------
- *		AmiTransactionOverride
- *
- *		This function is used to manipulate the bootstrap flag.
- * --------------------------------
- */
-void
-AmiTransactionOverride(bool flag)
-{
-	AMI_OVERRIDE = flag;
-}
-
 /* ----------------------------------------------------------------
  *						Interface functions
  *
@@ -184,12 +160,6 @@ TransactionIdDidCommit(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
-	if (AMI_OVERRIDE)
-	{
-		Assert(transactionId == BootstrapTransactionId);
-		return true;
-	}
-
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
@@ -233,12 +203,6 @@ TransactionIdDidAbort(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
-	if (AMI_OVERRIDE)
-	{
-		Assert(transactionId == BootstrapTransactionId);
-		return false;
-	}
-
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*

src/backend/access/transam/varsup.c

@@ -6,7 +6,7 @@
  * Copyright (c) 2000-2005, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.61 2005/02/20 02:21:28 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.62 2005/02/20 21:46:48 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,7 +41,7 @@ GetNewTransactionId(bool isSubXact)
 	 * During bootstrap initialization, we return the special bootstrap
 	 * transaction id.
 	 */
-	if (AMI_OVERRIDE)
+	if (IsBootstrapProcessingMode())
 		return BootstrapTransactionId;
 
 	LWLockAcquire(XidGenLock, LW_EXCLUSIVE);

src/backend/access/transam/xact.c

@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.196 2005/02/20 02:21:28 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.197 2005/02/20 21:46:48 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -450,22 +450,23 @@ GetCurrentTransactionNestLevel(void)
 
 /*
  *	TransactionIdIsCurrentTransactionId
- *
- *	During bootstrap, we cheat and say "it's not my transaction ID" even though
- *	it is.	Along with transam.c's cheat to say that the bootstrap XID is
- *	already committed, this causes the tqual.c routines to see previously
- *	inserted tuples as committed, which is what we need during bootstrap.
  */
 bool
 TransactionIdIsCurrentTransactionId(TransactionId xid)
 {
 	TransactionState s;
 
-	if (AMI_OVERRIDE)
-	{
-		Assert(xid == BootstrapTransactionId);
+	/*
+	 * We always say that BootstrapTransactionId is "not my transaction ID"
+	 * even when it is (ie, during bootstrap).  Along with the fact that
+	 * transam.c always treats BootstrapTransactionId as already committed,
+	 * this causes the tqual.c routines to see all tuples as committed,
+	 * which is what we need during bootstrap.  (Bootstrap mode only inserts
+	 * tuples, it never updates or deletes them, so all tuples can be presumed
+	 * good immediately.)
+	 */
+	if (xid == BootstrapTransactionId)
 		return false;
-	}
 
 	/*
 	 * We will return true for the Xid of the current subtransaction, any

src/backend/utils/init/postinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.139 2004/12/31 22:01:40 pgsql Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.140 2005/02/20 21:46:49 tgl Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -328,11 +328,6 @@ InitPostgres(const char *dbname, const char *username)
 	if (MyBackendId > MaxBackends || MyBackendId <= 0)
 		elog(FATAL, "bad backend id: %d", MyBackendId);
 
-	/*
-	 * Initialize the transaction system override state.
-	 */
-	AmiTransactionOverride(bootstrap);
-
 	/*
 	 * Initialize local process's access to XLOG.  In bootstrap case we
 	 * may skip this since StartupXLOG() was run instead.

src/include/access/transam.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/transam.h,v 1.52 2005/02/20 02:22:03 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/transam.h,v 1.53 2005/02/20 21:46:50 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -100,9 +100,6 @@ typedef VariableCacheData *VariableCache;
  * ----------------
  */
 
-/* in transam/transam.c */
-extern bool AMI_OVERRIDE;
-
 /* in transam/varsup.c */
 extern VariableCache ShmemVariableCache;
 
@@ -110,7 +107,6 @@ extern VariableCache ShmemVariableCache;
 /*
  * prototypes for functions in transam/transam.c
  */
-extern void AmiTransactionOverride(bool flag);
 extern bool TransactionIdDidCommit(TransactionId transactionId);
 extern bool TransactionIdDidAbort(TransactionId transactionId);
 extern void TransactionIdCommit(TransactionId transactionId);