This commit was manufactured by cvs2git to create branch 'ecpg_big_bison'.

Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian <bruce@momjian.us> 'Update copyright to 2002.'
Delete:
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1 files changed, 0 insertions, 2944 deletions

diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c
deleted file mode 100644
index 7e67099e442..00000000000
--- a/src/backend/commands/vacuum.c
+++ /dev/null
@@ -1,2944 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * vacuum.c
- *	  The postgres vacuum cleaner.
- *
- * This file includes the "full" version of VACUUM, as well as control code
- * used by all three of full VACUUM, lazy VACUUM, and ANALYZE.	See
- * vacuumlazy.c and analyze.c for the rest of the code for the latter two.
- *
- *
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.230 2002/06/20 20:29:27 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-#include <unistd.h>
-
-#include "access/clog.h"
-#include "access/genam.h"
-#include "access/heapam.h"
-#include "access/xlog.h"
-#include "catalog/catalog.h"
-#include "catalog/catname.h"
-#include "catalog/namespace.h"
-#include "catalog/pg_database.h"
-#include "catalog/pg_index.h"
-#include "commands/vacuum.h"
-#include "executor/executor.h"
-#include "miscadmin.h"
-#include "storage/freespace.h"
-#include "storage/sinval.h"
-#include "storage/smgr.h"
-#include "tcop/pquery.h"
-#include "utils/acl.h"
-#include "utils/builtins.h"
-#include "utils/fmgroids.h"
-#include "utils/inval.h"
-#include "utils/lsyscache.h"
-#include "utils/relcache.h"
-#include "utils/syscache.h"
-#include "pgstat.h"
-
-
-typedef struct VacPageData
-{
-	BlockNumber blkno;			/* BlockNumber of this Page */
-	Size		free;			/* FreeSpace on this Page */
-	uint16		offsets_used;	/* Number of OffNums used by vacuum */
-	uint16		offsets_free;	/* Number of OffNums free or to be free */
-	OffsetNumber offsets[1];	/* Array of free OffNums */
-} VacPageData;
-
-typedef VacPageData *VacPage;
-
-typedef struct VacPageListData
-{
-	BlockNumber empty_end_pages;	/* Number of "empty" end-pages */
-	int			num_pages;		/* Number of pages in pagedesc */
-	int			num_allocated_pages;	/* Number of allocated pages in
-										 * pagedesc */
-	VacPage    *pagedesc;		/* Descriptions of pages */
-} VacPageListData;
-
-typedef VacPageListData *VacPageList;
-
-typedef struct VTupleLinkData
-{
-	ItemPointerData new_tid;
-	ItemPointerData this_tid;
-} VTupleLinkData;
-
-typedef VTupleLinkData *VTupleLink;
-
-typedef struct VTupleMoveData
-{
-	ItemPointerData tid;		/* tuple ID */
-	VacPage		vacpage;		/* where to move */
-	bool		cleanVpd;		/* clean vacpage before using */
-} VTupleMoveData;
-
-typedef VTupleMoveData *VTupleMove;
-
-typedef struct VRelStats
-{
-	BlockNumber rel_pages;
-	double		rel_tuples;
-	Size		min_tlen;
-	Size		max_tlen;
-	bool		hasindex;
-	int			num_vtlinks;
-	VTupleLink	vtlinks;
-} VRelStats;
-
-
-static MemoryContext vac_context = NULL;
-
-static int elevel = -1;
-
-static TransactionId OldestXmin;
-static TransactionId FreezeLimit;
-
-static TransactionId initialOldestXmin;
-static TransactionId initialFreezeLimit;
-
-
-/* non-export function prototypes */
-static List *getrels(const RangeVar *vacrel, const char *stmttype);
-static void vac_update_dbstats(Oid dbid,
-				   TransactionId vacuumXID,
-				   TransactionId frozenXID);
-static void vac_truncate_clog(TransactionId vacuumXID,
-				  TransactionId frozenXID);
-static void vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind);
-static void full_vacuum_rel(Relation onerel, VacuumStmt *vacstmt);
-static void scan_heap(VRelStats *vacrelstats, Relation onerel,
-		  VacPageList vacuum_pages, VacPageList fraged_pages);
-static void repair_frag(VRelStats *vacrelstats, Relation onerel,
-			VacPageList vacuum_pages, VacPageList fraged_pages,
-			int nindexes, Relation *Irel);
-static void vacuum_heap(VRelStats *vacrelstats, Relation onerel,
-			VacPageList vacpagelist);
-static void vacuum_page(Relation onerel, Buffer buffer, VacPage vacpage);
-static void vacuum_index(VacPageList vacpagelist, Relation indrel,
-			 double num_tuples, int keep_tuples);
-static void scan_index(Relation indrel, double num_tuples);
-static bool tid_reaped(ItemPointer itemptr, void *state);
-static bool dummy_tid_reaped(ItemPointer itemptr, void *state);
-static void vac_update_fsm(Relation onerel, VacPageList fraged_pages,
-			   BlockNumber rel_pages);
-static VacPage copy_vac_page(VacPage vacpage);
-static void vpage_insert(VacPageList vacpagelist, VacPage vpnew);
-static void *vac_bsearch(const void *key, const void *base,
-			size_t nelem, size_t size,
-			int (*compar) (const void *, const void *));
-static int	vac_cmp_blk(const void *left, const void *right);
-static int	vac_cmp_offno(const void *left, const void *right);
-static int	vac_cmp_vtlinks(const void *left, const void *right);
-static bool enough_space(VacPage vacpage, Size len);
-
-
-/****************************************************************************
- *																			*
- *			Code common to all flavors of VACUUM and ANALYZE				*
- *																			*
- ****************************************************************************
- */
-
-
-/*
- * Primary entry point for VACUUM and ANALYZE commands.
- */
-void
-vacuum(VacuumStmt *vacstmt)
-{
-	const char *stmttype = vacstmt->vacuum ? "VACUUM" : "ANALYZE";
-	MemoryContext anl_context = NULL;
-	List	   *vrl,
-			   *cur;
-
-	if (vacstmt->verbose)
-		elevel = INFO;
-	else
-		elevel = DEBUG1;
-
-	/*
-	 * We cannot run VACUUM inside a user transaction block; if we were
-	 * inside a transaction, then our commit- and
-	 * start-transaction-command calls would not have the intended effect!
-	 * Furthermore, the forced commit that occurs before truncating the
-	 * relation's file would have the effect of committing the rest of the
-	 * user's transaction too, which would certainly not be the desired
-	 * behavior.
-	 */
-	if (vacstmt->vacuum && IsTransactionBlock())
-		elog(ERROR, "%s cannot run inside a BEGIN/END block", stmttype);
-
-	/* Running VACUUM from a function would free the function context */
-	if (vacstmt->vacuum && !MemoryContextContains(QueryContext, vacstmt))
-		elog(ERROR, "%s cannot be executed from a function", stmttype);
-
-	/*
-	 * Send info about dead objects to the statistics collector
-	 */
-	if (vacstmt->vacuum)
-		pgstat_vacuum_tabstat();
-
-	/*
-	 * Create special memory context for cross-transaction storage.
-	 *
-	 * Since it is a child of QueryContext, it will go away eventually even
-	 * if we suffer an error; there's no need for special abort cleanup
-	 * logic.
-	 */
-	vac_context = AllocSetContextCreate(QueryContext,
-										"Vacuum",
-										ALLOCSET_DEFAULT_MINSIZE,
-										ALLOCSET_DEFAULT_INITSIZE,
-										ALLOCSET_DEFAULT_MAXSIZE);
-
-	/*
-	 * If we are running only ANALYZE, we don't need per-table transactions,
-	 * but we still need a memory context with table lifetime.
-	 */
-	if (vacstmt->analyze && !vacstmt->vacuum)
-		anl_context = AllocSetContextCreate(QueryContext,
-											"Analyze",
-											ALLOCSET_DEFAULT_MINSIZE,
-											ALLOCSET_DEFAULT_INITSIZE,
-											ALLOCSET_DEFAULT_MAXSIZE);
-
-	/* Build list of relations to process (note this lives in vac_context) */
-	vrl = getrels(vacstmt->relation, stmttype);
-
-	/*
-	 * Formerly, there was code here to prevent more than one VACUUM from
-	 * executing concurrently in the same database.  However, there's no
-	 * good reason to prevent that, and manually removing lockfiles after
-	 * a vacuum crash was a pain for dbadmins.  So, forget about lockfiles,
-	 * and just rely on the locks we grab on each target table
-	 * to ensure that there aren't two VACUUMs running on the same table
-	 * at the same time.
-	 */
-
-	/*
-	 * The strangeness with committing and starting transactions here is due
-	 * to wanting to run each table's VACUUM as a separate transaction, so
-	 * that we don't hold locks unnecessarily long.  Also, if we are doing
-	 * VACUUM ANALYZE, the ANALYZE part runs as a separate transaction from
-	 * the VACUUM to further reduce locking.
-	 *
-	 * vacuum_rel expects to be entered with no transaction active; it will
-	 * start and commit its own transaction.  But we are called by an SQL
-	 * command, and so we are executing inside a transaction already.  We
-	 * commit the transaction started in PostgresMain() here, and start
-	 * another one before exiting to match the commit waiting for us back in
-	 * PostgresMain().
-	 *
-	 * In the case of an ANALYZE statement (no vacuum, just analyze) it's
-	 * okay to run the whole thing in the outer transaction, and so we skip
-	 * transaction start/stop operations.
-	 */
-	if (vacstmt->vacuum)
-	{
-		if (vacstmt->relation == NULL)
-		{
-			/*
-			 * It's a database-wide VACUUM.
-			 *
-			 * Compute the initially applicable OldestXmin and FreezeLimit
-			 * XIDs, so that we can record these values at the end of the
-			 * VACUUM. Note that individual tables may well be processed with
-			 * newer values, but we can guarantee that no (non-shared)
-			 * relations are processed with older ones.
-			 *
-			 * It is okay to record non-shared values in pg_database, even though
-			 * we may vacuum shared relations with older cutoffs, because only
-			 * the minimum of the values present in pg_database matters.  We
-			 * can be sure that shared relations have at some time been
-			 * vacuumed with cutoffs no worse than the global minimum; for, if
-			 * there is a backend in some other DB with xmin = OLDXMIN that's
-			 * determining the cutoff with which we vacuum shared relations,
-			 * it is not possible for that database to have a cutoff newer
-			 * than OLDXMIN recorded in pg_database.
-			 */
-			vacuum_set_xid_limits(vacstmt, false,
-								  &initialOldestXmin, &initialFreezeLimit);
-		}
-
-		/* matches the StartTransaction in PostgresMain() */
-		CommitTransactionCommand();
-	}
-
-	/*
-	 * Loop to process each selected relation.
-	 */
-	foreach(cur, vrl)
-	{
-		Oid		relid = (Oid) lfirsti(cur);
-
-		if (vacstmt->vacuum)
-			vacuum_rel(relid, vacstmt, RELKIND_RELATION);
-		if (vacstmt->analyze)
-		{
-			MemoryContext old_context = NULL;
-
-			/*
-			 * If we vacuumed, use new transaction for analyze.  Otherwise,
-			 * we can use the outer transaction, but we still need to call
-			 * analyze_rel in a memory context that will be cleaned up on
-			 * return (else we leak memory while processing multiple tables).
-			 */
-			if (vacstmt->vacuum)
-				StartTransactionCommand();
-			else
-				old_context = MemoryContextSwitchTo(anl_context);
-
-			analyze_rel(relid, vacstmt);
-
-			if (vacstmt->vacuum)
-				CommitTransactionCommand();
-			else
-			{
-				MemoryContextSwitchTo(old_context);
-				MemoryContextResetAndDeleteChildren(anl_context);
-			}
-		}
-	}
-
-	/*
-	 * Finish up processing.
-	 */
-	if (vacstmt->vacuum)
-	{
-		/* here, we are not in a transaction */
-
-		/* matches the CommitTransaction in PostgresMain() */
-		StartTransactionCommand();
-
-		/*
-		 * If we did a database-wide VACUUM, update the database's pg_database
-		 * row with info about the transaction IDs used, and try to truncate
-		 * pg_clog.
-		 */
-		if (vacstmt->relation == NULL)
-		{
-			vac_update_dbstats(MyDatabaseId,
-							   initialOldestXmin, initialFreezeLimit);
-			vac_truncate_clog(initialOldestXmin, initialFreezeLimit);
-		}
-	}
-
-	/*
-	 * Clean up working storage --- note we must do this after
-	 * StartTransactionCommand, else we might be trying to delete the
-	 * active context!
-	 */
-	MemoryContextDelete(vac_context);
-	vac_context = NULL;
-
-	if (anl_context)
-		MemoryContextDelete(anl_context);
-}
-
-/*
- * Build a list of Oids for each relation to be processed
- *
- * The list is built in vac_context so that it will survive across our
- * per-relation transactions.
- */
-static List *
-getrels(const RangeVar *vacrel, const char *stmttype)
-{
-	List	   *vrl = NIL;
-	MemoryContext oldcontext;
-
-	if (vacrel)
-	{
-		/* Process specific relation */
-		Oid		relid;
-
-		relid = RangeVarGetRelid(vacrel, false);
-
-		/* Make a relation list entry for this guy */
-		oldcontext = MemoryContextSwitchTo(vac_context);
-		vrl = lappendi(vrl, relid);
-		MemoryContextSwitchTo(oldcontext);
-	}
-	else
-	{
-		/* Process all plain relations listed in pg_class */
-		Relation	pgclass;
-		HeapScanDesc scan;
-		HeapTuple	tuple;
-		ScanKeyData key;
-
-		ScanKeyEntryInitialize(&key, 0x0,
-							   Anum_pg_class_relkind,
-							   F_CHAREQ,
-							   CharGetDatum(RELKIND_RELATION));
-
-		pgclass = heap_openr(RelationRelationName, AccessShareLock);
-
-		scan = heap_beginscan(pgclass, SnapshotNow, 1, &key);
-
-		while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
-		{
-			/* Make a relation list entry for this guy */
-			oldcontext = MemoryContextSwitchTo(vac_context);
-			vrl = lappendi(vrl, tuple->t_data->t_oid);
-			MemoryContextSwitchTo(oldcontext);
-		}
-
-		heap_endscan(scan);
-		heap_close(pgclass, AccessShareLock);
-	}
-
-	return vrl;
-}
-
-/*
- * vacuum_set_xid_limits() -- compute oldest-Xmin and freeze cutoff points
- */
-void
-vacuum_set_xid_limits(VacuumStmt *vacstmt, bool sharedRel,
-					  TransactionId *oldestXmin,
-					  TransactionId *freezeLimit)
-{
-	TransactionId limit;
-
-	*oldestXmin = GetOldestXmin(sharedRel);
-
-	Assert(TransactionIdIsNormal(*oldestXmin));
-
-	if (vacstmt->freeze)
-	{
-		/* FREEZE option: use oldest Xmin as freeze cutoff too */
-		limit = *oldestXmin;
-	}
-	else
-	{
-		/*
-		 * Normal case: freeze cutoff is well in the past, to wit, about
-		 * halfway to the wrap horizon
-		 */
-		limit = GetCurrentTransactionId() - (MaxTransactionId >> 2);
-	}
-
-	/*
-	 * Be careful not to generate a "permanent" XID
-	 */
-	if (!TransactionIdIsNormal(limit))
-		limit = FirstNormalTransactionId;
-
-	/*
-	 * Ensure sane relationship of limits
-	 */
-	if (TransactionIdFollows(limit, *oldestXmin))
-	{
-		elog(WARNING, "oldest Xmin is far in the past --- close open transactions soon to avoid wraparound problems");
-		limit = *oldestXmin;
-	}
-
-	*freezeLimit = limit;
-}
-
-
-/*
- *	vac_update_relstats() -- update statistics for one relation
- *
- *		Update the whole-relation statistics that are kept in its pg_class
- *		row.  There are additional stats that will be updated if we are
- *		doing ANALYZE, but we always update these stats.  This routine works
- *		for both index and heap relation entries in pg_class.
- *
- *		We violate no-overwrite semantics here by storing new values for the
- *		statistics columns directly into the pg_class tuple that's already on
- *		the page.  The reason for this is that if we updated these tuples in
- *		the usual way, vacuuming pg_class itself wouldn't work very well ---
- *		by the time we got done with a vacuum cycle, most of the tuples in
- *		pg_class would've been obsoleted.  Of course, this only works for
- *		fixed-size never-null columns, but these are.
- *
- *		This routine is shared by full VACUUM, lazy VACUUM, and stand-alone
- *		ANALYZE.
- */
-void
-vac_update_relstats(Oid relid, BlockNumber num_pages, double num_tuples,
-					bool hasindex)
-{
-	Relation	rd;
-	HeapTupleData rtup;
-	HeapTuple	ctup;
-	Form_pg_class pgcform;
-	Buffer		buffer;
-
-	/*
-	 * update number of tuples and number of pages in pg_class
-	 */
-	rd = heap_openr(RelationRelationName, RowExclusiveLock);
-
-	ctup = SearchSysCache(RELOID,
-						  ObjectIdGetDatum(relid),
-						  0, 0, 0);
-	if (!HeapTupleIsValid(ctup))
-		elog(ERROR, "pg_class entry for relid %u vanished during vacuuming",
-			 relid);
-
-	/* get the buffer cache tuple */
-	rtup.t_self = ctup->t_self;
-	ReleaseSysCache(ctup);
-	if (!heap_fetch(rd, SnapshotNow, &rtup, &buffer, false, NULL))
-		elog(ERROR, "pg_class entry for relid %u vanished during vacuuming",
-			 relid);
-
-	/* overwrite the existing statistics in the tuple */
-	pgcform = (Form_pg_class) GETSTRUCT(&rtup);
-	pgcform->relpages = (int32) num_pages;
-	pgcform->reltuples = num_tuples;
-	pgcform->relhasindex = hasindex;
-
-	/*
-	 * If we have discovered that there are no indexes, then there's no
-	 * primary key either.	This could be done more thoroughly...
-	 */
-	if (!hasindex)
-		pgcform->relhaspkey = false;
-
-	/*
-	 * Invalidate the tuple in the catcaches; this also arranges to flush
-	 * the relation's relcache entry.  (If we fail to commit for some reason,
-	 * no flush will occur, but no great harm is done since there are no
-	 * noncritical state updates here.)
-	 */
-	CacheInvalidateHeapTuple(rd, &rtup);
-
-	/* Write the buffer */
-	WriteBuffer(buffer);
-
-	heap_close(rd, RowExclusiveLock);
-}
-
-
-/*
- *	vac_update_dbstats() -- update statistics for one database
- *
- *		Update the whole-database statistics that are kept in its pg_database
- *		row.
- *
- *		We violate no-overwrite semantics here by storing new values for the
- *		statistics columns directly into the tuple that's already on the page.
- *		As with vac_update_relstats, this avoids leaving dead tuples behind
- *		after a VACUUM; which is good since GetRawDatabaseInfo
- *		can get confused by finding dead tuples in pg_database.
- *
- *		This routine is shared by full and lazy VACUUM.  Note that it is only
- *		applied after a database-wide VACUUM operation.
- */
-static void
-vac_update_dbstats(Oid dbid,
-				   TransactionId vacuumXID,
-				   TransactionId frozenXID)
-{
-	Relation	relation;
-	ScanKeyData entry[1];
-	HeapScanDesc scan;
-	HeapTuple	tuple;
-	Form_pg_database dbform;
-
-	relation = heap_openr(DatabaseRelationName, RowExclusiveLock);
-
-	/* Must use a heap scan, since there's no syscache for pg_database */
-	ScanKeyEntryInitialize(&entry[0], 0x0,
-						   ObjectIdAttributeNumber, F_OIDEQ,
-						   ObjectIdGetDatum(dbid));
-
-	scan = heap_beginscan(relation, SnapshotNow, 1, entry);
-
-	tuple = heap_getnext(scan, ForwardScanDirection);
-
-	if (!HeapTupleIsValid(tuple))
-		elog(ERROR, "database %u does not exist", dbid);
-
-	dbform = (Form_pg_database) GETSTRUCT(tuple);
-
-	/* overwrite the existing statistics in the tuple */
-	dbform->datvacuumxid = vacuumXID;
-	dbform->datfrozenxid = frozenXID;
-
-	/* invalidate the tuple in the cache and write the buffer */
-	CacheInvalidateHeapTuple(relation, tuple);
-	WriteNoReleaseBuffer(scan->rs_cbuf);
-
-	heap_endscan(scan);
-
-	heap_close(relation, RowExclusiveLock);
-}
-
-
-/*
- *	vac_truncate_clog() -- attempt to truncate the commit log
- *
- *		Scan pg_database to determine the system-wide oldest datvacuumxid,
- *		and use it to truncate the transaction commit log (pg_clog).
- *		Also generate a warning if the system-wide oldest datfrozenxid
- *		seems to be in danger of wrapping around.
- *
- *		The passed XIDs are simply the ones I just wrote into my pg_database
- *		entry.	They're used to initialize the "min" calculations.
- *
- *		This routine is shared by full and lazy VACUUM.  Note that it is only
- *		applied after a database-wide VACUUM operation.
- */
-static void
-vac_truncate_clog(TransactionId vacuumXID, TransactionId frozenXID)
-{
-	TransactionId myXID;
-	Relation	relation;
-	HeapScanDesc scan;
-	HeapTuple	tuple;
-	int32		age;
-	bool		vacuumAlreadyWrapped = false;
-	bool		frozenAlreadyWrapped = false;
-
-	myXID = GetCurrentTransactionId();
-
-	relation = heap_openr(DatabaseRelationName, AccessShareLock);
-
-	scan = heap_beginscan(relation, SnapshotNow, 0, NULL);
-
-	while ((tuple = heap_getnext(scan, ForwardScanDirection)) != NULL)
-	{
-		Form_pg_database dbform = (Form_pg_database) GETSTRUCT(tuple);
-
-		/* Ignore non-connectable databases (eg, template0) */
-		/* It's assumed that these have been frozen correctly */
-		if (!dbform->datallowconn)
-			continue;
-
-		if (TransactionIdIsNormal(dbform->datvacuumxid))
-		{
-			if (TransactionIdPrecedes(myXID, dbform->datvacuumxid))
-				vacuumAlreadyWrapped = true;
-			else if (TransactionIdPrecedes(dbform->datvacuumxid, vacuumXID))
-				vacuumXID = dbform->datvacuumxid;
-		}
-		if (TransactionIdIsNormal(dbform->datfrozenxid))
-		{
-			if (TransactionIdPrecedes(myXID, dbform->datfrozenxid))
-				frozenAlreadyWrapped = true;
-			else if (TransactionIdPrecedes(dbform->datfrozenxid, frozenXID))
-				frozenXID = dbform->datfrozenxid;
-		}
-	}
-
-	heap_endscan(scan);
-
-	heap_close(relation, AccessShareLock);
-
-	/*
-	 * Do not truncate CLOG if we seem to have suffered wraparound already;
-	 * the computed minimum XID might be bogus.
-	 */
-	if (vacuumAlreadyWrapped)
-	{
-		elog(WARNING, "Some databases have not been vacuumed in over 2 billion transactions."
-			 "\n\tYou may have already suffered transaction-wraparound data loss.");
-		return;
-	}
-
-	/* Truncate CLOG to the oldest vacuumxid */
-	TruncateCLOG(vacuumXID);
-
-	/* Give warning about impending wraparound problems */
-	if (frozenAlreadyWrapped)
-	{
-		elog(WARNING, "Some databases have not been vacuumed in over 1 billion transactions."
-			 "\n\tBetter vacuum them soon, or you may have a wraparound failure.");
-	}
-	else
-	{
-		age = (int32) (myXID - frozenXID);
-		if (age > (int32) ((MaxTransactionId >> 3) * 3))
-			elog(WARNING, "Some databases have not been vacuumed in %d transactions."
-				 "\n\tBetter vacuum them within %d transactions,"
-				 "\n\tor you may have a wraparound failure.",
-				 age, (int32) (MaxTransactionId >> 1) - age);
-	}
-}
-
-
-/****************************************************************************
- *																			*
- *			Code common to both flavors of VACUUM							*
- *																			*
- ****************************************************************************
- */
-
-
-/*
- *	vacuum_rel() -- vacuum one heap relation
- *
- *		Doing one heap at a time incurs extra overhead, since we need to
- *		check that the heap exists again just before we vacuum it.	The
- *		reason that we do this is so that vacuuming can be spread across
- *		many small transactions.  Otherwise, two-phase locking would require
- *		us to lock the entire database during one pass of the vacuum cleaner.
- *
- *		At entry and exit, we are not inside a transaction.
- */
-static void
-vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
-{
-	LOCKMODE	lmode;
-	Relation	onerel;
-	LockRelId	onerelid;
-	Oid			toast_relid;
-
-	/* Begin a transaction for vacuuming this relation */
-	StartTransactionCommand();
-
-	/*
-	 * Check for user-requested abort.	Note we want this to be inside a
-	 * transaction, so xact.c doesn't issue useless WARNING.
-	 */
-	CHECK_FOR_INTERRUPTS();
-
-	/*
-	 * Race condition -- if the pg_class tuple has gone away since the
-	 * last time we saw it, we don't need to vacuum it.
-	 */
-	if (!SearchSysCacheExists(RELOID,
-							  ObjectIdGetDatum(relid),
-							  0, 0, 0))
-	{
-		CommitTransactionCommand();
-		return;
-	}
-
-	/*
-	 * Determine the type of lock we want --- hard exclusive lock for a
-	 * FULL vacuum, but just ShareUpdateExclusiveLock for concurrent
-	 * vacuum.	Either way, we can be sure that no other backend is
-	 * vacuuming the same table.
-	 */
-	lmode = vacstmt->full ? AccessExclusiveLock : ShareUpdateExclusiveLock;
-
-	/*
-	 * Open the class, get an appropriate lock on it, and check
-	 * permissions.
-	 *
-	 * We allow the user to vacuum a table if he is superuser, the table
-	 * owner, or the database owner (but in the latter case, only if it's
-	 * not a shared relation).	pg_class_ownercheck includes the superuser case.
-	 *
-	 * Note we choose to treat permissions failure as a WARNING and keep
-	 * trying to vacuum the rest of the DB --- is this appropriate?
-	 */
-	onerel = relation_open(relid, lmode);
-
-	if (!(pg_class_ownercheck(RelationGetRelid(onerel), GetUserId()) ||
-		  (is_dbadmin(MyDatabaseId) && !onerel->rd_rel->relisshared)))
-	{
-		elog(WARNING, "Skipping \"%s\" --- only table or database owner can VACUUM it",
-			 RelationGetRelationName(onerel));
-		relation_close(onerel, lmode);
-		CommitTransactionCommand();
-		return;
-	}
-
-	/*
-	 * Check that it's a plain table; we used to do this in getrels() but
-	 * seems safer to check after we've locked the relation.
-	 */
-	if (onerel->rd_rel->relkind != expected_relkind)
-	{
-		elog(WARNING, "Skipping \"%s\" --- can not process indexes, views or special system tables",
-			 RelationGetRelationName(onerel));
-		relation_close(onerel, lmode);
-		CommitTransactionCommand();
-		return;
-	}
-
-	/*
-	 * Get a session-level lock too. This will protect our access to the
-	 * relation across multiple transactions, so that we can vacuum the
-	 * relation's TOAST table (if any) secure in the knowledge that no one
-	 * is deleting the parent relation.
-	 *
-	 * NOTE: this cannot block, even if someone else is waiting for access,
-	 * because the lock manager knows that both lock requests are from the
-	 * same process.
-	 */
-	onerelid = onerel->rd_lockInfo.lockRelId;
-	LockRelationForSession(&onerelid, lmode);
-
-	/*
-	 * Remember the relation's TOAST relation for later
-	 */
-	toast_relid = onerel->rd_rel->reltoastrelid;
-
-	/*
-	 * Do the actual work --- either FULL or "lazy" vacuum
-	 */
-	if (vacstmt->full)
-		full_vacuum_rel(onerel, vacstmt);
-	else
-		lazy_vacuum_rel(onerel, vacstmt);
-
-	/* all done with this class, but hold lock until commit */
-	relation_close(onerel, NoLock);
-
-	/*
-	 * Complete the transaction and free all temporary memory used.
-	 */
-	CommitTransactionCommand();
-
-	/*
-	 * If the relation has a secondary toast rel, vacuum that too while we
-	 * still hold the session lock on the master table.  Note however that
-	 * "analyze" will not get done on the toast table.	This is good,
-	 * because the toaster always uses hardcoded index access and
-	 * statistics are totally unimportant for toast relations.
-	 */
-	if (toast_relid != InvalidOid)
-		vacuum_rel(toast_relid, vacstmt, RELKIND_TOASTVALUE);
-
-	/*
-	 * Now release the session-level lock on the master table.
-	 */
-	UnlockRelationForSession(&onerelid, lmode);
-}
-
-
-/****************************************************************************
- *																			*
- *			Code for VACUUM FULL (only)										*
- *																			*
- ****************************************************************************
- */
-
-
-/*
- *	full_vacuum_rel() -- perform FULL VACUUM for one heap relation
- *
- *		This routine vacuums a single heap, cleans out its indexes, and
- *		updates its num_pages and num_tuples statistics.
- *
- *		At entry, we have already established a transaction and opened
- *		and locked the relation.
- */
-static void
-full_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
-{
-	VacPageListData vacuum_pages;		/* List of pages to vacuum and/or
-										 * clean indexes */
-	VacPageListData fraged_pages;		/* List of pages with space enough
-										 * for re-using */
-	Relation   *Irel;
-	int			nindexes,
-				i;
-	VRelStats  *vacrelstats;
-	bool		reindex = false;
-
-	if (IsIgnoringSystemIndexes() &&
-		IsSystemRelation(onerel))
-		reindex = true;
-
-	vacuum_set_xid_limits(vacstmt, onerel->rd_rel->relisshared,
-						  &OldestXmin, &FreezeLimit);
-
-	/*
-	 * Set up statistics-gathering machinery.
-	 */
-	vacrelstats = (VRelStats *) palloc(sizeof(VRelStats));
-	vacrelstats->rel_pages = 0;
-	vacrelstats->rel_tuples = 0;
-	vacrelstats->hasindex = false;
-
-	/* scan the heap */
-	vacuum_pages.num_pages = fraged_pages.num_pages = 0;
-	scan_heap(vacrelstats, onerel, &vacuum_pages, &fraged_pages);
-
-	/* Now open all indexes of the relation */
-	vac_open_indexes(onerel, &nindexes, &Irel);
-	if (!Irel)
-		reindex = false;
-	else if (!RelationGetForm(onerel)->relhasindex)
-		reindex = true;
-	if (nindexes > 0)
-		vacrelstats->hasindex = true;
-
-#ifdef NOT_USED
-
-	/*
-	 * reindex in VACUUM is dangerous under WAL. ifdef out until it
-	 * becomes safe.
-	 */
-	if (reindex)
-	{
-		vac_close_indexes(nindexes, Irel);
-		Irel = (Relation *) NULL;
-		activate_indexes_of_a_table(RelationGetRelid(onerel), false);
-	}
-#endif   /* NOT_USED */
-
-	/* Clean/scan index relation(s) */
-	if (Irel != (Relation *) NULL)
-	{
-		if (vacuum_pages.num_pages > 0)
-		{
-			for (i = 0; i < nindexes; i++)
-				vacuum_index(&vacuum_pages, Irel[i],
-							 vacrelstats->rel_tuples, 0);
-		}
-		else
-		{
-			/* just scan indexes to update statistic */
-			for (i = 0; i < nindexes; i++)
-				scan_index(Irel[i], vacrelstats->rel_tuples);
-		}
-	}
-
-	if (fraged_pages.num_pages > 0)
-	{
-		/* Try to shrink heap */
-		repair_frag(vacrelstats, onerel, &vacuum_pages, &fraged_pages,
-					nindexes, Irel);
-		vac_close_indexes(nindexes, Irel);
-	}
-	else
-	{
-		vac_close_indexes(nindexes, Irel);
-		if (vacuum_pages.num_pages > 0)
-		{
-			/* Clean pages from vacuum_pages list */
-			vacuum_heap(vacrelstats, onerel, &vacuum_pages);
-		}
-		else
-		{
-			/*
-			 * Flush dirty pages out to disk.  We must do this even if we
-			 * didn't do anything else, because we want to ensure that all
-			 * tuples have correct on-row commit status on disk (see
-			 * bufmgr.c's comments for FlushRelationBuffers()).
-			 */
-			i = FlushRelationBuffers(onerel, vacrelstats->rel_pages);
-			if (i < 0)
-				elog(ERROR, "VACUUM (full_vacuum_rel): FlushRelationBuffers returned %d",
-					 i);
-		}
-	}
-
-#ifdef NOT_USED
-	if (reindex)
-		activate_indexes_of_a_table(RelationGetRelid(onerel), true);
-#endif   /* NOT_USED */
-
-	/* update shared free space map with final free space info */
-	vac_update_fsm(onerel, &fraged_pages, vacrelstats->rel_pages);
-
-	/* update statistics in pg_class */
-	vac_update_relstats(RelationGetRelid(onerel), vacrelstats->rel_pages,
-						vacrelstats->rel_tuples, vacrelstats->hasindex);
-}
-
-
-/*
- *	scan_heap() -- scan an open heap relation
- *
- *		This routine sets commit status bits, constructs vacuum_pages (list
- *		of pages we need to compact free space on and/or clean indexes of
- *		deleted tuples), constructs fraged_pages (list of pages with free
- *		space that tuples could be moved into), and calculates statistics
- *		on the number of live tuples in the heap.
- */
-static void
-scan_heap(VRelStats *vacrelstats, Relation onerel,
-		  VacPageList vacuum_pages, VacPageList fraged_pages)
-{
-	BlockNumber nblocks,
-				blkno;
-	ItemId		itemid;
-	Buffer		buf;
-	HeapTupleData tuple;
-	OffsetNumber offnum,
-				maxoff;
-	bool		pgchanged,
-				tupgone,
-				notup;
-	char	   *relname;
-	VacPage		vacpage,
-				vacpagecopy;
-	BlockNumber empty_pages,
-				new_pages,
-				changed_pages,
-				empty_end_pages;
-	double		num_tuples,
-				tups_vacuumed,
-				nkeep,
-				nunused;
-	double		free_size,
-				usable_free_size;
-	Size		min_tlen = MaxTupleSize;
-	Size		max_tlen = 0;
-	int			i;
-	bool		do_shrinking = true;
-	VTupleLink	vtlinks = (VTupleLink) palloc(100 * sizeof(VTupleLinkData));
-	int			num_vtlinks = 0;
-	int			free_vtlinks = 100;
-	VacRUsage	ru0;
-
-	vac_init_rusage(&ru0);
-
-	relname = RelationGetRelationName(onerel);
-	elog(elevel, "--Relation %s.%s--",
-		 get_namespace_name(RelationGetNamespace(onerel)),
-		 relname);
-
-	empty_pages = new_pages = changed_pages = empty_end_pages = 0;
-	num_tuples = tups_vacuumed = nkeep = nunused = 0;
-	free_size = 0;
-
-	nblocks = RelationGetNumberOfBlocks(onerel);
-
-	/*
-	 * We initially create each VacPage item in a maximal-sized workspace,
-	 * then copy the workspace into a just-large-enough copy.
-	 */
-	vacpage = (VacPage) palloc(sizeof(VacPageData) + MaxOffsetNumber * sizeof(OffsetNumber));
-
-	for (blkno = 0; blkno < nblocks; blkno++)
-	{
-		Page		page,
-					tempPage = NULL;
-		bool		do_reap,
-					do_frag;
-
-		CHECK_FOR_INTERRUPTS();
-
-		buf = ReadBuffer(onerel, blkno);
-		page = BufferGetPage(buf);
-
-		vacpage->blkno = blkno;
-		vacpage->offsets_used = 0;
-		vacpage->offsets_free = 0;
-
-		if (PageIsNew(page))
-		{
-			elog(WARNING, "Rel %s: Uninitialized page %u - fixing",
-				 relname, blkno);
-			PageInit(page, BufferGetPageSize(buf), 0);
-			vacpage->free = ((PageHeader) page)->pd_upper - ((PageHeader) page)->pd_lower;
-			free_size += (vacpage->free - sizeof(ItemIdData));
-			new_pages++;
-			empty_end_pages++;
-			vacpagecopy = copy_vac_page(vacpage);
-			vpage_insert(vacuum_pages, vacpagecopy);
-			vpage_insert(fraged_pages, vacpagecopy);
-			WriteBuffer(buf);
-			continue;
-		}
-
-		if (PageIsEmpty(page))
-		{
-			vacpage->free = ((PageHeader) page)->pd_upper - ((PageHeader) page)->pd_lower;
-			free_size += (vacpage->free - sizeof(ItemIdData));
-			empty_pages++;
-			empty_end_pages++;
-			vacpagecopy = copy_vac_page(vacpage);
-			vpage_insert(vacuum_pages, vacpagecopy);
-			vpage_insert(fraged_pages, vacpagecopy);
-			ReleaseBuffer(buf);
-			continue;
-		}
-
-		pgchanged = false;
-		notup = true;
-		maxoff = PageGetMaxOffsetNumber(page);
-		for (offnum = FirstOffsetNumber;
-			 offnum <= maxoff;
-			 offnum = OffsetNumberNext(offnum))
-		{
-			uint16		sv_infomask;
-
-			itemid = PageGetItemId(page, offnum);
-
-			/*
-			 * Collect un-used items too - it's possible to have indexes
-			 * pointing here after crash.
-			 */
-			if (!ItemIdIsUsed(itemid))
-			{
-				vacpage->offsets[vacpage->offsets_free++] = offnum;
-				nunused += 1;
-				continue;
-			}
-
-			tuple.t_datamcxt = NULL;
-			tuple.t_data = (HeapTupleHeader) PageGetItem(page, itemid);
-			tuple.t_len = ItemIdGetLength(itemid);
-			ItemPointerSet(&(tuple.t_self), blkno, offnum);
-
-			tupgone = false;
-			sv_infomask = tuple.t_data->t_infomask;
-
-			switch (HeapTupleSatisfiesVacuum(tuple.t_data, OldestXmin))
-			{
-				case HEAPTUPLE_DEAD:
-					tupgone = true;		/* we can delete the tuple */
-					break;
-				case HEAPTUPLE_LIVE:
-
-					/*
-					 * Tuple is good.  Consider whether to replace its
-					 * xmin value with FrozenTransactionId.
-					 */
-					if (TransactionIdIsNormal(HeapTupleHeaderGetXmin(tuple.t_data)) &&
-						TransactionIdPrecedes(HeapTupleHeaderGetXmin(tuple.t_data),
-											  FreezeLimit))
-					{
-						HeapTupleHeaderSetXmin(tuple.t_data, FrozenTransactionId);
-						/* infomask should be okay already */
-						Assert(tuple.t_data->t_infomask & HEAP_XMIN_COMMITTED);
-						pgchanged = true;
-					}
-					break;
-				case HEAPTUPLE_RECENTLY_DEAD:
-
-					/*
-					 * If tuple is recently deleted then we must not
-					 * remove it from relation.
-					 */
-					nkeep += 1;
-
-					/*
-					 * If we do shrinking and this tuple is updated one
-					 * then remember it to construct updated tuple
-					 * dependencies.
-					 */
-					if (do_shrinking &&
-						!(ItemPointerEquals(&(tuple.t_self),
-											&(tuple.t_data->t_ctid))))
-					{
-						if (free_vtlinks == 0)
-						{
-							free_vtlinks = 1000;
-							vtlinks = (VTupleLink) repalloc(vtlinks,
-										   (free_vtlinks + num_vtlinks) *
-												 sizeof(VTupleLinkData));
-						}
-						vtlinks[num_vtlinks].new_tid = tuple.t_data->t_ctid;
-						vtlinks[num_vtlinks].this_tid = tuple.t_self;
-						free_vtlinks--;
-						num_vtlinks++;
-					}
-					break;
-				case HEAPTUPLE_INSERT_IN_PROGRESS:
-
-					/*
-					 * This should not happen, since we hold exclusive
-					 * lock on the relation; shouldn't we raise an error?
-					 */
-					elog(WARNING, "Rel %s: TID %u/%u: InsertTransactionInProgress %u - can't shrink relation",
-						 relname, blkno, offnum, HeapTupleHeaderGetXmin(tuple.t_data));
-					do_shrinking = false;
-					break;
-				case HEAPTUPLE_DELETE_IN_PROGRESS:
-
-					/*
-					 * This should not happen, since we hold exclusive
-					 * lock on the relation; shouldn't we raise an error?
-					 */
-					elog(WARNING, "Rel %s: TID %u/%u: DeleteTransactionInProgress %u - can't shrink relation",
-						 relname, blkno, offnum, HeapTupleHeaderGetXmax(tuple.t_data));
-					do_shrinking = false;
-					break;
-				default:
-					elog(ERROR, "Unexpected HeapTupleSatisfiesVacuum result");
-					break;
-			}
-
-			/* check for hint-bit update by HeapTupleSatisfiesVacuum */
-			if (sv_infomask != tuple.t_data->t_infomask)
-				pgchanged = true;
-
-			/*
-			 * Other checks...
-			 */
-			if (!OidIsValid(tuple.t_data->t_oid) &&
-				onerel->rd_rel->relhasoids)
-				elog(WARNING, "Rel %s: TID %u/%u: OID IS INVALID. TUPGONE %d.",
-					 relname, blkno, offnum, (int) tupgone);
-
-			if (tupgone)
-			{
-				ItemId		lpp;
-
-				/*
-				 * Here we are building a temporary copy of the page with
-				 * dead tuples removed.  Below we will apply
-				 * PageRepairFragmentation to the copy, so that we can
-				 * determine how much space will be available after
-				 * removal of dead tuples.	But note we are NOT changing
-				 * the real page yet...
-				 */
-				if (tempPage == (Page) NULL)
-				{
-					Size		pageSize;
-
-					pageSize = PageGetPageSize(page);
-					tempPage = (Page) palloc(pageSize);
-					memcpy(tempPage, page, pageSize);
-				}
-
-				/* mark it unused on the temp page */
-				lpp = PageGetItemId(tempPage, offnum);
-				lpp->lp_flags &= ~LP_USED;
-
-				vacpage->offsets[vacpage->offsets_free++] = offnum;
-				tups_vacuumed += 1;
-			}
-			else
-			{
-				num_tuples += 1;
-				notup = false;
-				if (tuple.t_len < min_tlen)
-					min_tlen = tuple.t_len;
-				if (tuple.t_len > max_tlen)
-					max_tlen = tuple.t_len;
-			}
-		}						/* scan along page */
-
-		if (tempPage != (Page) NULL)
-		{
-			/* Some tuples are removable; figure free space after removal */
-			PageRepairFragmentation(tempPage, NULL);
-			vacpage->free = ((PageHeader) tempPage)->pd_upper - ((PageHeader) tempPage)->pd_lower;
-			pfree(tempPage);
-			do_reap = true;
-		}
-		else
-		{
-			/* Just use current available space */
-			vacpage->free = ((PageHeader) page)->pd_upper - ((PageHeader) page)->pd_lower;
-			/* Need to reap the page if it has ~LP_USED line pointers */
-			do_reap = (vacpage->offsets_free > 0);
-		}
-
-		free_size += vacpage->free;
-
-		/*
-		 * Add the page to fraged_pages if it has a useful amount of free
-		 * space.  "Useful" means enough for a minimal-sized tuple. But we
-		 * don't know that accurately near the start of the relation, so
-		 * add pages unconditionally if they have >= BLCKSZ/10 free space.
-		 */
-		do_frag = (vacpage->free >= min_tlen || vacpage->free >= BLCKSZ / 10);
-
-		if (do_reap || do_frag)
-		{
-			vacpagecopy = copy_vac_page(vacpage);
-			if (do_reap)
-				vpage_insert(vacuum_pages, vacpagecopy);
-			if (do_frag)
-				vpage_insert(fraged_pages, vacpagecopy);
-		}
-
-		if (notup)
-			empty_end_pages++;
-		else
-			empty_end_pages = 0;
-
-		if (pgchanged)
-		{
-			WriteBuffer(buf);
-			changed_pages++;
-		}
-		else
-			ReleaseBuffer(buf);
-	}
-
-	pfree(vacpage);
-
-	/* save stats in the rel list for use later */
-	vacrelstats->rel_tuples = num_tuples;
-	vacrelstats->rel_pages = nblocks;
-	if (num_tuples == 0)
-		min_tlen = max_tlen = 0;
-	vacrelstats->min_tlen = min_tlen;
-	vacrelstats->max_tlen = max_tlen;
-
-	vacuum_pages->empty_end_pages = empty_end_pages;
-	fraged_pages->empty_end_pages = empty_end_pages;
-
-	/*
-	 * Clear the fraged_pages list if we found we couldn't shrink. Else,
-	 * remove any "empty" end-pages from the list, and compute usable free
-	 * space = free space in remaining pages.
-	 */
-	if (do_shrinking)
-	{
-		Assert((BlockNumber) fraged_pages->num_pages >= empty_end_pages);
-		fraged_pages->num_pages -= empty_end_pages;
-		usable_free_size = 0;
-		for (i = 0; i < fraged_pages->num_pages; i++)
-			usable_free_size += fraged_pages->pagedesc[i]->free;
-	}
-	else
-	{
-		fraged_pages->num_pages = 0;
-		usable_free_size = 0;
-	}
-
-	if (usable_free_size > 0 && num_vtlinks > 0)
-	{
-		qsort((char *) vtlinks, num_vtlinks, sizeof(VTupleLinkData),
-			  vac_cmp_vtlinks);
-		vacrelstats->vtlinks = vtlinks;
-		vacrelstats->num_vtlinks = num_vtlinks;
-	}
-	else
-	{
-		vacrelstats->vtlinks = NULL;
-		vacrelstats->num_vtlinks = 0;
-		pfree(vtlinks);
-	}
-
-	elog(elevel, "Pages %u: Changed %u, reaped %u, Empty %u, New %u; \
-Tup %.0f: Vac %.0f, Keep/VTL %.0f/%u, UnUsed %.0f, MinLen %lu, MaxLen %lu; \
-Re-using: Free/Avail. Space %.0f/%.0f; EndEmpty/Avail. Pages %u/%u.\n\t%s",
-		 nblocks, changed_pages, vacuum_pages->num_pages, empty_pages,
-		 new_pages, num_tuples, tups_vacuumed,
-		 nkeep, vacrelstats->num_vtlinks,
-		 nunused, (unsigned long) min_tlen, (unsigned long) max_tlen,
-		 free_size, usable_free_size,
-		 empty_end_pages, fraged_pages->num_pages,
-		 vac_show_rusage(&ru0));
-
-}
-
-
-/*
- *	repair_frag() -- try to repair relation's fragmentation
- *
- *		This routine marks dead tuples as unused and tries re-use dead space
- *		by moving tuples (and inserting indexes if needed). It constructs
- *		Nvacpagelist list of free-ed pages (moved tuples) and clean indexes
- *		for them after committing (in hack-manner - without losing locks
- *		and freeing memory!) current transaction. It truncates relation
- *		if some end-blocks are gone away.
- */
-static void
-repair_frag(VRelStats *vacrelstats, Relation onerel,
-			VacPageList vacuum_pages, VacPageList fraged_pages,
-			int nindexes, Relation *Irel)
-{
-	TransactionId myXID;
-	CommandId	myCID;
-	Buffer		buf,
-				cur_buffer;
-	BlockNumber nblocks,
-				blkno;
-	BlockNumber last_move_dest_block = 0,
-				last_vacuum_block;
-	Page		page,
-				ToPage = NULL;
-	OffsetNumber offnum,
-				maxoff,
-				newoff,
-				max_offset;
-	ItemId		itemid,
-				newitemid;
-	HeapTupleData tuple,
-				newtup;
-	TupleDesc	tupdesc;
-	ResultRelInfo *resultRelInfo;
-	EState	   *estate;
-	TupleTable	tupleTable;
-	TupleTableSlot *slot;
-	VacPageListData Nvacpagelist;
-	VacPage		cur_page = NULL,
-				last_vacuum_page,
-				vacpage,
-			   *curpage;
-	int			cur_item = 0;
-	int			i;
-	Size		tuple_len;
-	int			num_moved,
-				num_fraged_pages,
-				vacuumed_pages;
-	int			checked_moved,
-				num_tuples,
-				keep_tuples = 0;
-	bool		isempty,
-				dowrite,
-				chain_tuple_moved;
-	VacRUsage	ru0;
-
-	vac_init_rusage(&ru0);
-
-	myXID = GetCurrentTransactionId();
-	myCID = GetCurrentCommandId();
-
-	tupdesc = RelationGetDescr(onerel);
-
-	/*
-	 * We need a ResultRelInfo and an EState so we can use the regular
-	 * executor's index-entry-making machinery.
-	 */
-	resultRelInfo = makeNode(ResultRelInfo);
-	resultRelInfo->ri_RangeTableIndex = 1;		/* dummy */
-	resultRelInfo->ri_RelationDesc = onerel;
-	resultRelInfo->ri_TrigDesc = NULL;	/* we don't fire triggers */
-
-	ExecOpenIndices(resultRelInfo);
-
-	estate = CreateExecutorState();
-	estate->es_result_relations = resultRelInfo;
-	estate->es_num_result_relations = 1;
-	estate->es_result_relation_info = resultRelInfo;
-
-	/* Set up a dummy tuple table too */
-	tupleTable = ExecCreateTupleTable(1);
-	slot = ExecAllocTableSlot(tupleTable);
-	ExecSetSlotDescriptor(slot, tupdesc, false);
-
-	Nvacpagelist.num_pages = 0;
-	num_fraged_pages = fraged_pages->num_pages;
-	Assert((BlockNumber) vacuum_pages->num_pages >= vacuum_pages->empty_end_pages);
-	vacuumed_pages = vacuum_pages->num_pages - vacuum_pages->empty_end_pages;
-	if (vacuumed_pages > 0)
-	{
-		/* get last reaped page from vacuum_pages */
-		last_vacuum_page = vacuum_pages->pagedesc[vacuumed_pages - 1];
-		last_vacuum_block = last_vacuum_page->blkno;
-	}
-	else
-	{
-		last_vacuum_page = NULL;
-		last_vacuum_block = InvalidBlockNumber;
-	}
-	cur_buffer = InvalidBuffer;
-	num_moved = 0;
-
-	vacpage = (VacPage) palloc(sizeof(VacPageData) + MaxOffsetNumber * sizeof(OffsetNumber));
-	vacpage->offsets_used = vacpage->offsets_free = 0;
-
-	/*
-	 * Scan pages backwards from the last nonempty page, trying to move
-	 * tuples down to lower pages.	Quit when we reach a page that we have
-	 * moved any tuples onto, or the first page if we haven't moved
-	 * anything, or when we find a page we cannot completely empty (this
-	 * last condition is handled by "break" statements within the loop).
-	 *
-	 * NB: this code depends on the vacuum_pages and fraged_pages lists being
-	 * in order by blkno.
-	 */
-	nblocks = vacrelstats->rel_pages;
-	for (blkno = nblocks - vacuum_pages->empty_end_pages - 1;
-		 blkno > last_move_dest_block;
-		 blkno--)
-	{
-		CHECK_FOR_INTERRUPTS();
-
-		/*
-		 * Forget fraged_pages pages at or after this one; they're no
-		 * longer useful as move targets, since we only want to move down.
-		 * Note that since we stop the outer loop at last_move_dest_block,
-		 * pages removed here cannot have had anything moved onto them
-		 * already.
-		 *
-		 * Also note that we don't change the stored fraged_pages list, only
-		 * our local variable num_fraged_pages; so the forgotten pages are
-		 * still available to be loaded into the free space map later.
-		 */
-		while (num_fraged_pages > 0 &&
-			fraged_pages->pagedesc[num_fraged_pages - 1]->blkno >= blkno)
-		{
-			Assert(fraged_pages->pagedesc[num_fraged_pages - 1]->offsets_used == 0);
-			--num_fraged_pages;
-		}
-
-		/*
-		 * Process this page of relation.
-		 */
-		buf = ReadBuffer(onerel, blkno);
-		page = BufferGetPage(buf);
-
-		vacpage->offsets_free = 0;
-
-		isempty = PageIsEmpty(page);
-
-		dowrite = false;
-
-		/* Is the page in the vacuum_pages list? */
-		if (blkno == last_vacuum_block)
-		{
-			if (last_vacuum_page->offsets_free > 0)
-			{
-				/* there are dead tuples on this page - clean them */
-				Assert(!isempty);
-				LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-				vacuum_page(onerel, buf, last_vacuum_page);
-				LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-				dowrite = true;
-			}
-			else
-				Assert(isempty);
-			--vacuumed_pages;
-			if (vacuumed_pages > 0)
-			{
-				/* get prev reaped page from vacuum_pages */
-				last_vacuum_page = vacuum_pages->pagedesc[vacuumed_pages - 1];
-				last_vacuum_block = last_vacuum_page->blkno;
-			}
-			else
-			{
-				last_vacuum_page = NULL;
-				last_vacuum_block = InvalidBlockNumber;
-			}
-			if (isempty)
-			{
-				ReleaseBuffer(buf);
-				continue;
-			}
-		}
-		else
-			Assert(!isempty);
-
-		chain_tuple_moved = false;		/* no one chain-tuple was moved
-										 * off this page, yet */
-		vacpage->blkno = blkno;
-		maxoff = PageGetMaxOffsetNumber(page);
-		for (offnum = FirstOffsetNumber;
-			 offnum <= maxoff;
-			 offnum = OffsetNumberNext(offnum))
-		{
-			itemid = PageGetItemId(page, offnum);
-
-			if (!ItemIdIsUsed(itemid))
-				continue;
-
-			tuple.t_datamcxt = NULL;
-			tuple.t_data = (HeapTupleHeader) PageGetItem(page, itemid);
-			tuple_len = tuple.t_len = ItemIdGetLength(itemid);
-			ItemPointerSet(&(tuple.t_self), blkno, offnum);
-
-			if (!(tuple.t_data->t_infomask & HEAP_XMIN_COMMITTED))
-			{
-				if (HeapTupleHeaderGetXvac(tuple.t_data) != myXID)
-					elog(ERROR, "Invalid XVAC in tuple header");
-				if (tuple.t_data->t_infomask & HEAP_MOVED_IN)
-					elog(ERROR, "HEAP_MOVED_IN was not expected");
-
-				/*
-				 * If this (chain) tuple is moved by me already then I
-				 * have to check is it in vacpage or not - i.e. is it
-				 * moved while cleaning this page or some previous one.
-				 */
-				if (tuple.t_data->t_infomask & HEAP_MOVED_OFF)
-				{
-					if (keep_tuples == 0)
-						continue;
-					if (chain_tuple_moved)		/* some chains was moved
-												 * while */
-					{			/* cleaning this page */
-						Assert(vacpage->offsets_free > 0);
-						for (i = 0; i < vacpage->offsets_free; i++)
-						{
-							if (vacpage->offsets[i] == offnum)
-								break;
-						}
-						if (i >= vacpage->offsets_free) /* not found */
-						{
-							vacpage->offsets[vacpage->offsets_free++] = offnum;
-							keep_tuples--;
-						}
-					}
-					else
-					{
-						vacpage->offsets[vacpage->offsets_free++] = offnum;
-						keep_tuples--;
-					}
-					continue;
-				}
-				elog(ERROR, "HEAP_MOVED_OFF was expected");
-			}
-
-			/*
-			 * If this tuple is in the chain of tuples created in updates
-			 * by "recent" transactions then we have to move all chain of
-			 * tuples to another places.
-			 */
-			if ((tuple.t_data->t_infomask & HEAP_UPDATED &&
-			 !TransactionIdPrecedes(HeapTupleHeaderGetXmin(tuple.t_data),
-			                        OldestXmin)) ||
-				(!(tuple.t_data->t_infomask & HEAP_XMAX_INVALID) &&
-				 !(ItemPointerEquals(&(tuple.t_self),
-									 &(tuple.t_data->t_ctid)))))
-			{
-				Buffer		Cbuf = buf;
-				Page		Cpage;
-				ItemId		Citemid;
-				ItemPointerData Ctid;
-				HeapTupleData tp = tuple;
-				Size		tlen = tuple_len;
-				VTupleMove	vtmove = (VTupleMove)
-				palloc(100 * sizeof(VTupleMoveData));
-				int			num_vtmove = 0;
-				int			free_vtmove = 100;
-				VacPage		to_vacpage = NULL;
-				int			to_item = 0;
-				bool		freeCbuf = false;
-				int			ti;
-
-				if (vacrelstats->vtlinks == NULL)
-					elog(ERROR, "No one parent tuple was found");
-				if (cur_buffer != InvalidBuffer)
-				{
-					WriteBuffer(cur_buffer);
-					cur_buffer = InvalidBuffer;
-				}
-
-				/*
-				 * If this tuple is in the begin/middle of the chain then
-				 * we have to move to the end of chain.
-				 */
-				while (!(tp.t_data->t_infomask & HEAP_XMAX_INVALID) &&
-					   !(ItemPointerEquals(&(tp.t_self),
-										   &(tp.t_data->t_ctid))))
-				{
-					Ctid = tp.t_data->t_ctid;
-					if (freeCbuf)
-						ReleaseBuffer(Cbuf);
-					freeCbuf = true;
-					Cbuf = ReadBuffer(onerel,
-									  ItemPointerGetBlockNumber(&Ctid));
-					Cpage = BufferGetPage(Cbuf);
-					Citemid = PageGetItemId(Cpage,
-									  ItemPointerGetOffsetNumber(&Ctid));
-					if (!ItemIdIsUsed(Citemid))
-					{
-						/*
-						 * This means that in the middle of chain there
-						 * was tuple updated by older (than OldestXmin)
-						 * xaction and this tuple is already deleted by
-						 * me. Actually, upper part of chain should be
-						 * removed and seems that this should be handled
-						 * in scan_heap(), but it's not implemented at the
-						 * moment and so we just stop shrinking here.
-						 */
-						ReleaseBuffer(Cbuf);
-						pfree(vtmove);
-						vtmove = NULL;
-						elog(WARNING, "Child itemid in update-chain marked as unused - can't continue repair_frag");
-						break;
-					}
-					tp.t_datamcxt = NULL;
-					tp.t_data = (HeapTupleHeader) PageGetItem(Cpage, Citemid);
-					tp.t_self = Ctid;
-					tlen = tp.t_len = ItemIdGetLength(Citemid);
-				}
-				if (vtmove == NULL)
-					break;
-				/* first, can chain be moved ? */
-				for (;;)
-				{
-					if (to_vacpage == NULL ||
-						!enough_space(to_vacpage, tlen))
-					{
-						for (i = 0; i < num_fraged_pages; i++)
-						{
-							if (enough_space(fraged_pages->pagedesc[i], tlen))
-								break;
-						}
-
-						if (i == num_fraged_pages)
-						{
-							/* can't move item anywhere */
-							for (i = 0; i < num_vtmove; i++)
-							{
-								Assert(vtmove[i].vacpage->offsets_used > 0);
-								(vtmove[i].vacpage->offsets_used)--;
-							}
-							num_vtmove = 0;
-							break;
-						}
-						to_item = i;
-						to_vacpage = fraged_pages->pagedesc[to_item];
-					}
-					to_vacpage->free -= MAXALIGN(tlen);
-					if (to_vacpage->offsets_used >= to_vacpage->offsets_free)
-						to_vacpage->free -= MAXALIGN(sizeof(ItemIdData));
-					(to_vacpage->offsets_used)++;
-					if (free_vtmove == 0)
-					{
-						free_vtmove = 1000;
-						vtmove = (VTupleMove) repalloc(vtmove,
-											 (free_vtmove + num_vtmove) *
-												 sizeof(VTupleMoveData));
-					}
-					vtmove[num_vtmove].tid = tp.t_self;
-					vtmove[num_vtmove].vacpage = to_vacpage;
-					if (to_vacpage->offsets_used == 1)
-						vtmove[num_vtmove].cleanVpd = true;
-					else
-						vtmove[num_vtmove].cleanVpd = false;
-					free_vtmove--;
-					num_vtmove++;
-
-					/* All done ? */
-					if (!(tp.t_data->t_infomask & HEAP_UPDATED) ||
-					    TransactionIdPrecedes(HeapTupleHeaderGetXmin(tp.t_data),
-					                          OldestXmin))
-						break;
-
-					/* Well, try to find tuple with old row version */
-					for (;;)
-					{
-						Buffer		Pbuf;
-						Page		Ppage;
-						ItemId		Pitemid;
-						HeapTupleData Ptp;
-						VTupleLinkData vtld,
-								   *vtlp;
-
-						vtld.new_tid = tp.t_self;
-						vtlp = (VTupleLink)
-							vac_bsearch((void *) &vtld,
-										(void *) (vacrelstats->vtlinks),
-										vacrelstats->num_vtlinks,
-										sizeof(VTupleLinkData),
-										vac_cmp_vtlinks);
-						if (vtlp == NULL)
-							elog(ERROR, "Parent tuple was not found");
-						tp.t_self = vtlp->this_tid;
-						Pbuf = ReadBuffer(onerel,
-								ItemPointerGetBlockNumber(&(tp.t_self)));
-						Ppage = BufferGetPage(Pbuf);
-						Pitemid = PageGetItemId(Ppage,
-							   ItemPointerGetOffsetNumber(&(tp.t_self)));
-						if (!ItemIdIsUsed(Pitemid))
-							elog(ERROR, "Parent itemid marked as unused");
-						Ptp.t_datamcxt = NULL;
-						Ptp.t_data = (HeapTupleHeader) PageGetItem(Ppage, Pitemid);
-						Assert(ItemPointerEquals(&(vtld.new_tid),
-												 &(Ptp.t_data->t_ctid)));
-
-						/*
-						 * Read above about cases when
-						 * !ItemIdIsUsed(Citemid) (child item is
-						 * removed)... Due to the fact that at the moment
-						 * we don't remove unuseful part of update-chain,
-						 * it's possible to get too old parent row here.
-						 * Like as in the case which caused this problem,
-						 * we stop shrinking here. I could try to find
-						 * real parent row but want not to do it because
-						 * of real solution will be implemented anyway,
-						 * latter, and we are too close to 6.5 release. -
-						 * vadim 06/11/99
-						 */
-						if (!(TransactionIdEquals(HeapTupleHeaderGetXmax(Ptp.t_data),
-												  HeapTupleHeaderGetXmin(tp.t_data))))
-						{
-							if (freeCbuf)
-								ReleaseBuffer(Cbuf);
-							freeCbuf = false;
-							ReleaseBuffer(Pbuf);
-							for (i = 0; i < num_vtmove; i++)
-							{
-								Assert(vtmove[i].vacpage->offsets_used > 0);
-								(vtmove[i].vacpage->offsets_used)--;
-							}
-							num_vtmove = 0;
-							elog(WARNING, "Too old parent tuple found - can't continue repair_frag");
-							break;
-						}
-#ifdef NOT_USED					/* I'm not sure that this will wotk
-								 * properly... */
-
-						/*
-						 * If this tuple is updated version of row and it
-						 * was created by the same transaction then no one
-						 * is interested in this tuple - mark it as
-						 * removed.
-						 */
-						if (Ptp.t_data->t_infomask & HEAP_UPDATED &&
-							TransactionIdEquals(HeapTupleHeaderGetXmin(Ptp.t_data),
-												HeapTupleHeaderGetXmax(Ptp.t_data)))
-						{
-							Ptp.t_data->t_infomask &=
-								~(HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID | HEAP_MOVED_IN);
-							Ptp.t_data->t_infomask |= HEAP_MOVED_OFF;
-							HeapTupleHeaderSetXvac(Ptp.t_data, myXID);
-							WriteBuffer(Pbuf);
-							continue;
-						}
-#endif
-						tp.t_datamcxt = Ptp.t_datamcxt;
-						tp.t_data = Ptp.t_data;
-						tlen = tp.t_len = ItemIdGetLength(Pitemid);
-						if (freeCbuf)
-							ReleaseBuffer(Cbuf);
-						Cbuf = Pbuf;
-						freeCbuf = true;
-						break;
-					}
-					if (num_vtmove == 0)
-						break;
-				}
-				if (freeCbuf)
-					ReleaseBuffer(Cbuf);
-				if (num_vtmove == 0)	/* chain can't be moved */
-				{
-					pfree(vtmove);
-					break;
-				}
-				ItemPointerSetInvalid(&Ctid);
-				for (ti = 0; ti < num_vtmove; ti++)
-				{
-					VacPage		destvacpage = vtmove[ti].vacpage;
-
-					/* Get page to move from */
-					tuple.t_self = vtmove[ti].tid;
-					Cbuf = ReadBuffer(onerel,
-							 ItemPointerGetBlockNumber(&(tuple.t_self)));
-
-					/* Get page to move to */
-					cur_buffer = ReadBuffer(onerel, destvacpage->blkno);
-
-					LockBuffer(cur_buffer, BUFFER_LOCK_EXCLUSIVE);
-					if (cur_buffer != Cbuf)
-						LockBuffer(Cbuf, BUFFER_LOCK_EXCLUSIVE);
-
-					ToPage = BufferGetPage(cur_buffer);
-					Cpage = BufferGetPage(Cbuf);
-
-					Citemid = PageGetItemId(Cpage,
-							ItemPointerGetOffsetNumber(&(tuple.t_self)));
-					tuple.t_datamcxt = NULL;
-					tuple.t_data = (HeapTupleHeader) PageGetItem(Cpage, Citemid);
-					tuple_len = tuple.t_len = ItemIdGetLength(Citemid);
-
-					/*
-					 * make a copy of the source tuple, and then mark the
-					 * source tuple MOVED_OFF.
-					 */
-					heap_copytuple_with_tuple(&tuple, &newtup);
-
-					/*
-					 * register invalidation of source tuple in catcaches.
-					 */
-					CacheInvalidateHeapTuple(onerel, &tuple);
-
-					/* NO ELOG(ERROR) TILL CHANGES ARE LOGGED */
-					START_CRIT_SECTION();
-
-					tuple.t_data->t_infomask &=
-						~(HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID | HEAP_MOVED_IN);
-					tuple.t_data->t_infomask |= HEAP_MOVED_OFF;
-					HeapTupleHeaderSetXvac(tuple.t_data, myXID);
-
-					/*
-					 * If this page was not used before - clean it.
-					 *
-					 * NOTE: a nasty bug used to lurk here.  It is possible
-					 * for the source and destination pages to be the same
-					 * (since this tuple-chain member can be on a page
-					 * lower than the one we're currently processing in
-					 * the outer loop).  If that's true, then after
-					 * vacuum_page() the source tuple will have been
-					 * moved, and tuple.t_data will be pointing at
-					 * garbage.  Therefore we must do everything that uses
-					 * tuple.t_data BEFORE this step!!
-					 *
-					 * This path is different from the other callers of
-					 * vacuum_page, because we have already incremented
-					 * the vacpage's offsets_used field to account for the
-					 * tuple(s) we expect to move onto the page. Therefore
-					 * vacuum_page's check for offsets_used == 0 is wrong.
-					 * But since that's a good debugging check for all
-					 * other callers, we work around it here rather than
-					 * remove it.
-					 */
-					if (!PageIsEmpty(ToPage) && vtmove[ti].cleanVpd)
-					{
-						int			sv_offsets_used = destvacpage->offsets_used;
-
-						destvacpage->offsets_used = 0;
-						vacuum_page(onerel, cur_buffer, destvacpage);
-						destvacpage->offsets_used = sv_offsets_used;
-					}
-
-					/*
-					 * Update the state of the copied tuple, and store it
-					 * on the destination page.
-					 */
-					newtup.t_data->t_infomask &=
-						~(HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID | HEAP_MOVED_OFF);
-					newtup.t_data->t_infomask |= HEAP_MOVED_IN;
-					HeapTupleHeaderSetXvac(newtup.t_data, myXID);
-					newoff = PageAddItem(ToPage, (Item) newtup.t_data, tuple_len,
-										 InvalidOffsetNumber, LP_USED);
-					if (newoff == InvalidOffsetNumber)
-					{
-						elog(PANIC, "moving chain: failed to add item with len = %lu to page %u",
-						  (unsigned long) tuple_len, destvacpage->blkno);
-					}
-					newitemid = PageGetItemId(ToPage, newoff);
-					pfree(newtup.t_data);
-					newtup.t_datamcxt = NULL;
-					newtup.t_data = (HeapTupleHeader) PageGetItem(ToPage, newitemid);
-					ItemPointerSet(&(newtup.t_self), destvacpage->blkno, newoff);
-
-					{
-						XLogRecPtr	recptr =
-						log_heap_move(onerel, Cbuf, tuple.t_self,
-									  cur_buffer, &newtup);
-
-						if (Cbuf != cur_buffer)
-						{
-							PageSetLSN(Cpage, recptr);
-							PageSetSUI(Cpage, ThisStartUpID);
-						}
-						PageSetLSN(ToPage, recptr);
-						PageSetSUI(ToPage, ThisStartUpID);
-					}
-					END_CRIT_SECTION();
-
-					if (destvacpage->blkno > last_move_dest_block)
-						last_move_dest_block = destvacpage->blkno;
-
-					/*
-					 * Set new tuple's t_ctid pointing to itself for last
-					 * tuple in chain, and to next tuple in chain
-					 * otherwise.
-					 */
-					if (!ItemPointerIsValid(&Ctid))
-						newtup.t_data->t_ctid = newtup.t_self;
-					else
-						newtup.t_data->t_ctid = Ctid;
-					Ctid = newtup.t_self;
-
-					num_moved++;
-
-					/*
-					 * Remember that we moved tuple from the current page
-					 * (corresponding index tuple will be cleaned).
-					 */
-					if (Cbuf == buf)
-						vacpage->offsets[vacpage->offsets_free++] =
-							ItemPointerGetOffsetNumber(&(tuple.t_self));
-					else
-						keep_tuples++;
-
-					LockBuffer(cur_buffer, BUFFER_LOCK_UNLOCK);
-					if (cur_buffer != Cbuf)
-						LockBuffer(Cbuf, BUFFER_LOCK_UNLOCK);
-
-					/* Create index entries for the moved tuple */
-					if (resultRelInfo->ri_NumIndices > 0)
-					{
-						ExecStoreTuple(&newtup, slot, InvalidBuffer, false);
-						ExecInsertIndexTuples(slot, &(newtup.t_self),
-											  estate, true);
-					}
-
-					WriteBuffer(cur_buffer);
-					WriteBuffer(Cbuf);
-				}
-				cur_buffer = InvalidBuffer;
-				pfree(vtmove);
-				chain_tuple_moved = true;
-				continue;
-			}
-
-			/* try to find new page for this tuple */
-			if (cur_buffer == InvalidBuffer ||
-				!enough_space(cur_page, tuple_len))
-			{
-				if (cur_buffer != InvalidBuffer)
-				{
-					WriteBuffer(cur_buffer);
-					cur_buffer = InvalidBuffer;
-				}
-				for (i = 0; i < num_fraged_pages; i++)
-				{
-					if (enough_space(fraged_pages->pagedesc[i], tuple_len))
-						break;
-				}
-				if (i == num_fraged_pages)
-					break;		/* can't move item anywhere */
-				cur_item = i;
-				cur_page = fraged_pages->pagedesc[cur_item];
-				cur_buffer = ReadBuffer(onerel, cur_page->blkno);
-				LockBuffer(cur_buffer, BUFFER_LOCK_EXCLUSIVE);
-				ToPage = BufferGetPage(cur_buffer);
-				/* if this page was not used before - clean it */
-				if (!PageIsEmpty(ToPage) && cur_page->offsets_used == 0)
-					vacuum_page(onerel, cur_buffer, cur_page);
-			}
-			else
-				LockBuffer(cur_buffer, BUFFER_LOCK_EXCLUSIVE);
-
-			LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-
-			/* copy tuple */
-			heap_copytuple_with_tuple(&tuple, &newtup);
-
-			/*
-			 * register invalidation of source tuple in catcaches.
-			 *
-			 * (Note: we do not need to register the copied tuple,
-			 * because we are not changing the tuple contents and
-			 * so there cannot be any need to flush negative
-			 * catcache entries.)
-			 */
-			CacheInvalidateHeapTuple(onerel, &tuple);
-
-			/* NO ELOG(ERROR) TILL CHANGES ARE LOGGED */
-			START_CRIT_SECTION();
-
-			/*
-			 * Mark new tuple as moved_in by vacuum and store vacuum XID
-			 * in t_cmin !!!
-			 */
-			newtup.t_data->t_infomask &=
-				~(HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID | HEAP_MOVED_OFF);
-			newtup.t_data->t_infomask |= HEAP_MOVED_IN;
-			HeapTupleHeaderSetXvac(newtup.t_data, myXID);
-
-			/* add tuple to the page */
-			newoff = PageAddItem(ToPage, (Item) newtup.t_data, tuple_len,
-								 InvalidOffsetNumber, LP_USED);
-			if (newoff == InvalidOffsetNumber)
-			{
-				elog(PANIC, "failed to add item with len = %lu to page %u (free space %lu, nusd %u, noff %u)",
-					 (unsigned long) tuple_len,
-					 cur_page->blkno, (unsigned long) cur_page->free,
-					 cur_page->offsets_used, cur_page->offsets_free);
-			}
-			newitemid = PageGetItemId(ToPage, newoff);
-			pfree(newtup.t_data);
-			newtup.t_datamcxt = NULL;
-			newtup.t_data = (HeapTupleHeader) PageGetItem(ToPage, newitemid);
-			ItemPointerSet(&(newtup.t_data->t_ctid), cur_page->blkno, newoff);
-			newtup.t_self = newtup.t_data->t_ctid;
-
-			/*
-			 * Mark old tuple as moved_off by vacuum and store vacuum XID
-			 * in t_cmin !!!
-			 */
-			tuple.t_data->t_infomask &=
-				~(HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID | HEAP_MOVED_IN);
-			tuple.t_data->t_infomask |= HEAP_MOVED_OFF;
-			HeapTupleHeaderSetXvac(tuple.t_data, myXID);
-
-			{
-				XLogRecPtr	recptr =
-				log_heap_move(onerel, buf, tuple.t_self,
-							  cur_buffer, &newtup);
-
-				PageSetLSN(page, recptr);
-				PageSetSUI(page, ThisStartUpID);
-				PageSetLSN(ToPage, recptr);
-				PageSetSUI(ToPage, ThisStartUpID);
-			}
-			END_CRIT_SECTION();
-
-			cur_page->offsets_used++;
-			num_moved++;
-			cur_page->free = ((PageHeader) ToPage)->pd_upper - ((PageHeader) ToPage)->pd_lower;
-			if (cur_page->blkno > last_move_dest_block)
-				last_move_dest_block = cur_page->blkno;
-
-			vacpage->offsets[vacpage->offsets_free++] = offnum;
-
-			LockBuffer(cur_buffer, BUFFER_LOCK_UNLOCK);
-			LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-
-			/* insert index' tuples if needed */
-			if (resultRelInfo->ri_NumIndices > 0)
-			{
-				ExecStoreTuple(&newtup, slot, InvalidBuffer, false);
-				ExecInsertIndexTuples(slot, &(newtup.t_self), estate, true);
-			}
-		}						/* walk along page */
-
-		if (offnum < maxoff && keep_tuples > 0)
-		{
-			OffsetNumber off;
-
-			for (off = OffsetNumberNext(offnum);
-				 off <= maxoff;
-				 off = OffsetNumberNext(off))
-			{
-				itemid = PageGetItemId(page, off);
-				if (!ItemIdIsUsed(itemid))
-					continue;
-				tuple.t_datamcxt = NULL;
-				tuple.t_data = (HeapTupleHeader) PageGetItem(page, itemid);
-				if (tuple.t_data->t_infomask & HEAP_XMIN_COMMITTED)
-					continue;
-				if (HeapTupleHeaderGetXvac(tuple.t_data) != myXID)
-					elog(ERROR, "Invalid XVAC in tuple header (4)");
-				if (tuple.t_data->t_infomask & HEAP_MOVED_IN)
-					elog(ERROR, "HEAP_MOVED_IN was not expected (2)");
-				if (tuple.t_data->t_infomask & HEAP_MOVED_OFF)
-				{
-					/* some chains was moved while */
-					if (chain_tuple_moved)
-					{			/* cleaning this page */
-						Assert(vacpage->offsets_free > 0);
-						for (i = 0; i < vacpage->offsets_free; i++)
-						{
-							if (vacpage->offsets[i] == off)
-								break;
-						}
-						if (i >= vacpage->offsets_free) /* not found */
-						{
-							vacpage->offsets[vacpage->offsets_free++] = off;
-							Assert(keep_tuples > 0);
-							keep_tuples--;
-						}
-					}
-					else
-					{
-						vacpage->offsets[vacpage->offsets_free++] = off;
-						Assert(keep_tuples > 0);
-						keep_tuples--;
-					}
-				}
-			}
-		}
-
-		if (vacpage->offsets_free > 0)	/* some tuples were moved */
-		{
-			if (chain_tuple_moved)		/* else - they are ordered */
-			{
-				qsort((char *) (vacpage->offsets), vacpage->offsets_free,
-					  sizeof(OffsetNumber), vac_cmp_offno);
-			}
-			vpage_insert(&Nvacpagelist, copy_vac_page(vacpage));
-			WriteBuffer(buf);
-		}
-		else if (dowrite)
-			WriteBuffer(buf);
-		else
-			ReleaseBuffer(buf);
-
-		if (offnum <= maxoff)
-			break;				/* some item(s) left */
-
-	}							/* walk along relation */
-
-	blkno++;					/* new number of blocks */
-
-	if (cur_buffer != InvalidBuffer)
-	{
-		Assert(num_moved > 0);
-		WriteBuffer(cur_buffer);
-	}
-
-	if (num_moved > 0)
-	{
-		/*
-		 * We have to commit our tuple movings before we truncate the
-		 * relation.  Ideally we should do Commit/StartTransactionCommand
-		 * here, relying on the session-level table lock to protect our
-		 * exclusive access to the relation.  However, that would require
-		 * a lot of extra code to close and re-open the relation, indexes,
-		 * etc.  For now, a quick hack: record status of current
-		 * transaction as committed, and continue.
-		 */
-		RecordTransactionCommit();
-	}
-
-	/*
-	 * We are not going to move any more tuples across pages, but we still
-	 * need to apply vacuum_page to compact free space in the remaining
-	 * pages in vacuum_pages list.	Note that some of these pages may also
-	 * be in the fraged_pages list, and may have had tuples moved onto
-	 * them; if so, we already did vacuum_page and needn't do it again.
-	 */
-	for (i = 0, curpage = vacuum_pages->pagedesc;
-		 i < vacuumed_pages;
-		 i++, curpage++)
-	{
-		CHECK_FOR_INTERRUPTS();
-		Assert((*curpage)->blkno < blkno);
-		if ((*curpage)->offsets_used == 0)
-		{
-			/* this page was not used as a move target, so must clean it */
-			buf = ReadBuffer(onerel, (*curpage)->blkno);
-			LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-			page = BufferGetPage(buf);
-			if (!PageIsEmpty(page))
-				vacuum_page(onerel, buf, *curpage);
-			LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-			WriteBuffer(buf);
-		}
-	}
-
-	/*
-	 * Now scan all the pages that we moved tuples onto and update tuple
-	 * status bits.  This is not really necessary, but will save time for
-	 * future transactions examining these tuples.
-	 *
-	 * XXX WARNING that this code fails to clear HEAP_MOVED_OFF tuples from
-	 * pages that were move source pages but not move dest pages.  One
-	 * also wonders whether it wouldn't be better to skip this step and
-	 * let the tuple status updates happen someplace that's not holding an
-	 * exclusive lock on the relation.
-	 */
-	checked_moved = 0;
-	for (i = 0, curpage = fraged_pages->pagedesc;
-		 i < num_fraged_pages;
-		 i++, curpage++)
-	{
-		CHECK_FOR_INTERRUPTS();
-		Assert((*curpage)->blkno < blkno);
-		if ((*curpage)->blkno > last_move_dest_block)
-			break;				/* no need to scan any further */
-		if ((*curpage)->offsets_used == 0)
-			continue;			/* this page was never used as a move dest */
-		buf = ReadBuffer(onerel, (*curpage)->blkno);
-		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-		page = BufferGetPage(buf);
-		num_tuples = 0;
-		max_offset = PageGetMaxOffsetNumber(page);
-		for (newoff = FirstOffsetNumber;
-			 newoff <= max_offset;
-			 newoff = OffsetNumberNext(newoff))
-		{
-			itemid = PageGetItemId(page, newoff);
-			if (!ItemIdIsUsed(itemid))
-				continue;
-			tuple.t_datamcxt = NULL;
-			tuple.t_data = (HeapTupleHeader) PageGetItem(page, itemid);
-			if (!(tuple.t_data->t_infomask & HEAP_XMIN_COMMITTED))
-			{
-				if (HeapTupleHeaderGetXvac(tuple.t_data) != myXID)
-					elog(ERROR, "Invalid XVAC in tuple header (2)");
-				if (tuple.t_data->t_infomask & HEAP_MOVED_IN)
-				{
-					tuple.t_data->t_infomask |= HEAP_XMIN_COMMITTED;
-					num_tuples++;
-				}
-				else if (tuple.t_data->t_infomask & HEAP_MOVED_OFF)
-					tuple.t_data->t_infomask |= HEAP_XMIN_INVALID;
-				else
-					elog(ERROR, "HEAP_MOVED_OFF/HEAP_MOVED_IN was expected");
-			}
-		}
-		LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-		WriteBuffer(buf);
-		Assert((*curpage)->offsets_used == num_tuples);
-		checked_moved += num_tuples;
-	}
-	Assert(num_moved == checked_moved);
-
-	elog(elevel, "Rel %s: Pages: %u --> %u; Tuple(s) moved: %u.\n\t%s",
-		 RelationGetRelationName(onerel),
-		 nblocks, blkno, num_moved,
-		 vac_show_rusage(&ru0));
-
-	/*
-	 * Reflect the motion of system tuples to catalog cache here.
-	 */
-	CommandCounterIncrement();
-
-	if (Nvacpagelist.num_pages > 0)
-	{
-		/* vacuum indexes again if needed */
-		if (Irel != (Relation *) NULL)
-		{
-			VacPage    *vpleft,
-					   *vpright,
-						vpsave;
-
-			/* re-sort Nvacpagelist.pagedesc */
-			for (vpleft = Nvacpagelist.pagedesc,
-			vpright = Nvacpagelist.pagedesc + Nvacpagelist.num_pages - 1;
-				 vpleft < vpright; vpleft++, vpright--)
-			{
-				vpsave = *vpleft;
-				*vpleft = *vpright;
-				*vpright = vpsave;
-			}
-			Assert(keep_tuples >= 0);
-			for (i = 0; i < nindexes; i++)
-				vacuum_index(&Nvacpagelist, Irel[i],
-							 vacrelstats->rel_tuples, keep_tuples);
-		}
-
-		/* clean moved tuples from last page in Nvacpagelist list */
-		if (vacpage->blkno == (blkno - 1) &&
-			vacpage->offsets_free > 0)
-		{
-			OffsetNumber unbuf[BLCKSZ / sizeof(OffsetNumber)];
-			OffsetNumber *unused = unbuf;
-			int			uncnt;
-
-			buf = ReadBuffer(onerel, vacpage->blkno);
-			LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-			page = BufferGetPage(buf);
-			num_tuples = 0;
-			maxoff = PageGetMaxOffsetNumber(page);
-			for (offnum = FirstOffsetNumber;
-				 offnum <= maxoff;
-				 offnum = OffsetNumberNext(offnum))
-			{
-				itemid = PageGetItemId(page, offnum);
-				if (!ItemIdIsUsed(itemid))
-					continue;
-				tuple.t_datamcxt = NULL;
-				tuple.t_data = (HeapTupleHeader) PageGetItem(page, itemid);
-
-				if (!(tuple.t_data->t_infomask & HEAP_XMIN_COMMITTED))
-				{
-					if (HeapTupleHeaderGetXvac(tuple.t_data) != myXID)
-						elog(ERROR, "Invalid XVAC in tuple header (3)");
-					if (tuple.t_data->t_infomask & HEAP_MOVED_OFF)
-					{
-						itemid->lp_flags &= ~LP_USED;
-						num_tuples++;
-					}
-					else
-						elog(ERROR, "HEAP_MOVED_OFF was expected (2)");
-				}
-
-			}
-			Assert(vacpage->offsets_free == num_tuples);
-			START_CRIT_SECTION();
-			uncnt = PageRepairFragmentation(page, unused);
-			{
-				XLogRecPtr	recptr;
-
-				recptr = log_heap_clean(onerel, buf, (char *) unused,
-						  (char *) (&(unused[uncnt])) - (char *) unused);
-				PageSetLSN(page, recptr);
-				PageSetSUI(page, ThisStartUpID);
-			}
-			END_CRIT_SECTION();
-			LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-			WriteBuffer(buf);
-		}
-
-		/* now - free new list of reaped pages */
-		curpage = Nvacpagelist.pagedesc;
-		for (i = 0; i < Nvacpagelist.num_pages; i++, curpage++)
-			pfree(*curpage);
-		pfree(Nvacpagelist.pagedesc);
-	}
-
-	/*
-	 * Flush dirty pages out to disk.  We do this unconditionally, even if
-	 * we don't need to truncate, because we want to ensure that all
-	 * tuples have correct on-row commit status on disk (see bufmgr.c's
-	 * comments for FlushRelationBuffers()).
-	 */
-	i = FlushRelationBuffers(onerel, blkno);
-	if (i < 0)
-		elog(ERROR, "VACUUM (repair_frag): FlushRelationBuffers returned %d",
-			 i);
-
-	/* truncate relation, if needed */
-	if (blkno < nblocks)
-	{
-		blkno = smgrtruncate(DEFAULT_SMGR, onerel, blkno);
-		onerel->rd_nblocks = blkno;		/* update relcache immediately */
-		onerel->rd_targblock = InvalidBlockNumber;
-		vacrelstats->rel_pages = blkno; /* set new number of blocks */
-	}
-
-	/* clean up */
-	pfree(vacpage);
-	if (vacrelstats->vtlinks != NULL)
-		pfree(vacrelstats->vtlinks);
-
-	ExecDropTupleTable(tupleTable, true);
-
-	ExecCloseIndices(resultRelInfo);
-}
-
-/*
- *	vacuum_heap() -- free dead tuples
- *
- *		This routine marks dead tuples as unused and truncates relation
- *		if there are "empty" end-blocks.
- */
-static void
-vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages)
-{
-	Buffer		buf;
-	VacPage    *vacpage;
-	BlockNumber relblocks;
-	int			nblocks;
-	int			i;
-
-	nblocks = vacuum_pages->num_pages;
-	nblocks -= vacuum_pages->empty_end_pages;	/* nothing to do with them */
-
-	for (i = 0, vacpage = vacuum_pages->pagedesc; i < nblocks; i++, vacpage++)
-	{
-		CHECK_FOR_INTERRUPTS();
-		if ((*vacpage)->offsets_free > 0)
-		{
-			buf = ReadBuffer(onerel, (*vacpage)->blkno);
-			LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
-			vacuum_page(onerel, buf, *vacpage);
-			LockBuffer(buf, BUFFER_LOCK_UNLOCK);
-			WriteBuffer(buf);
-		}
-	}
-
-	/*
-	 * Flush dirty pages out to disk.  We do this unconditionally, even if
-	 * we don't need to truncate, because we want to ensure that all
-	 * tuples have correct on-row commit status on disk (see bufmgr.c's
-	 * comments for FlushRelationBuffers()).
-	 */
-	Assert(vacrelstats->rel_pages >= vacuum_pages->empty_end_pages);
-	relblocks = vacrelstats->rel_pages - vacuum_pages->empty_end_pages;
-
-	i = FlushRelationBuffers(onerel, relblocks);
-	if (i < 0)
-		elog(ERROR, "VACUUM (vacuum_heap): FlushRelationBuffers returned %d",
-			 i);
-
-	/* truncate relation if there are some empty end-pages */
-	if (vacuum_pages->empty_end_pages > 0)
-	{
-		elog(elevel, "Rel %s: Pages: %u --> %u.",
-			 RelationGetRelationName(onerel),
-			 vacrelstats->rel_pages, relblocks);
-		relblocks = smgrtruncate(DEFAULT_SMGR, onerel, relblocks);
-		onerel->rd_nblocks = relblocks; /* update relcache immediately */
-		onerel->rd_targblock = InvalidBlockNumber;
-		vacrelstats->rel_pages = relblocks;		/* set new number of
-												 * blocks */
-	}
-}
-
-/*
- *	vacuum_page() -- free dead tuples on a page
- *					 and repair its fragmentation.
- */
-static void
-vacuum_page(Relation onerel, Buffer buffer, VacPage vacpage)
-{
-	OffsetNumber unbuf[BLCKSZ / sizeof(OffsetNumber)];
-	OffsetNumber *unused = unbuf;
-	int			uncnt;
-	Page		page = BufferGetPage(buffer);
-	ItemId		itemid;
-	int			i;
-
-	/* There shouldn't be any tuples moved onto the page yet! */
-	Assert(vacpage->offsets_used == 0);
-
-	START_CRIT_SECTION();
-	for (i = 0; i < vacpage->offsets_free; i++)
-	{
-		itemid = PageGetItemId(page, vacpage->offsets[i]);
-		itemid->lp_flags &= ~LP_USED;
-	}
-	uncnt = PageRepairFragmentation(page, unused);
-	{
-		XLogRecPtr	recptr;
-
-		recptr = log_heap_clean(onerel, buffer, (char *) unused,
-						  (char *) (&(unused[uncnt])) - (char *) unused);
-		PageSetLSN(page, recptr);
-		PageSetSUI(page, ThisStartUpID);
-	}
-	END_CRIT_SECTION();
-}
-
-/*
- *	scan_index() -- scan one index relation to update statistic.
- *
- * We use this when we have no deletions to do.
- */
-static void
-scan_index(Relation indrel, double num_tuples)
-{
-	IndexBulkDeleteResult *stats;
-	VacRUsage	ru0;
-
-	vac_init_rusage(&ru0);
-
-	/*
-	 * Even though we're not planning to delete anything, use the
-	 * ambulkdelete call, so that the scan happens within the index AM for
-	 * more speed.
-	 */
-	stats = index_bulk_delete(indrel, dummy_tid_reaped, NULL);
-
-	if (!stats)
-		return;
-
-	/* now update statistics in pg_class */
-	vac_update_relstats(RelationGetRelid(indrel),
-						stats->num_pages, stats->num_index_tuples,
-						false);
-
-	elog(elevel, "Index %s: Pages %u; Tuples %.0f.\n\t%s",
-		 RelationGetRelationName(indrel),
-		 stats->num_pages, stats->num_index_tuples,
-		 vac_show_rusage(&ru0));
-
-	/*
-	 * Check for tuple count mismatch.	If the index is partial, then it's
-	 * OK for it to have fewer tuples than the heap; else we got trouble.
-	 */
-	if (stats->num_index_tuples != num_tuples)
-	{
-		if (stats->num_index_tuples > num_tuples ||
-			!vac_is_partial_index(indrel))
-			elog(WARNING, "Index %s: NUMBER OF INDEX' TUPLES (%.0f) IS NOT THE SAME AS HEAP' (%.0f).\
-\n\tRecreate the index.",
-				 RelationGetRelationName(indrel),
-				 stats->num_index_tuples, num_tuples);
-	}
-
-	pfree(stats);
-}
-
-/*
- *	vacuum_index() -- vacuum one index relation.
- *
- *		Vpl is the VacPageList of the heap we're currently vacuuming.
- *		It's locked. Indrel is an index relation on the vacuumed heap.
- *
- *		We don't bother to set locks on the index relation here, since
- *		the parent table is exclusive-locked already.
- *
- *		Finally, we arrange to update the index relation's statistics in
- *		pg_class.
- */
-static void
-vacuum_index(VacPageList vacpagelist, Relation indrel,
-			 double num_tuples, int keep_tuples)
-{
-	IndexBulkDeleteResult *stats;
-	VacRUsage	ru0;
-
-	vac_init_rusage(&ru0);
-
-	/* Do bulk deletion */
-	stats = index_bulk_delete(indrel, tid_reaped, (void *) vacpagelist);
-
-	if (!stats)
-		return;
-
-	/* now update statistics in pg_class */
-	vac_update_relstats(RelationGetRelid(indrel),
-						stats->num_pages, stats->num_index_tuples,
-						false);
-
-	elog(elevel, "Index %s: Pages %u; Tuples %.0f: Deleted %.0f.\n\t%s",
-		 RelationGetRelationName(indrel), stats->num_pages,
-		 stats->num_index_tuples - keep_tuples, stats->tuples_removed,
-		 vac_show_rusage(&ru0));
-
-	/*
-	 * Check for tuple count mismatch.	If the index is partial, then it's
-	 * OK for it to have fewer tuples than the heap; else we got trouble.
-	 */
-	if (stats->num_index_tuples != num_tuples + keep_tuples)
-	{
-		if (stats->num_index_tuples > num_tuples + keep_tuples ||
-			!vac_is_partial_index(indrel))
-			elog(WARNING, "Index %s: NUMBER OF INDEX' TUPLES (%.0f) IS NOT THE SAME AS HEAP' (%.0f).\
-\n\tRecreate the index.",
-				 RelationGetRelationName(indrel),
-				 stats->num_index_tuples, num_tuples);
-	}
-
-	pfree(stats);
-}
-
-/*
- *	tid_reaped() -- is a particular tid reaped?
- *
- *		This has the right signature to be an IndexBulkDeleteCallback.
- *
- *		vacpagelist->VacPage_array is sorted in right order.
- */
-static bool
-tid_reaped(ItemPointer itemptr, void *state)
-{
-	VacPageList vacpagelist = (VacPageList) state;
-	OffsetNumber ioffno;
-	OffsetNumber *voff;
-	VacPage		vp,
-			   *vpp;
-	VacPageData vacpage;
-
-	vacpage.blkno = ItemPointerGetBlockNumber(itemptr);
-	ioffno = ItemPointerGetOffsetNumber(itemptr);
-
-	vp = &vacpage;
-	vpp = (VacPage *) vac_bsearch((void *) &vp,
-								  (void *) (vacpagelist->pagedesc),
-								  vacpagelist->num_pages,
-								  sizeof(VacPage),
-								  vac_cmp_blk);
-
-	if (vpp == NULL)
-		return false;
-
-	/* ok - we are on a partially or fully reaped page */
-	vp = *vpp;
-
-	if (vp->offsets_free == 0)
-	{
-		/* this is EmptyPage, so claim all tuples on it are reaped!!! */
-		return true;
-	}
-
-	voff = (OffsetNumber *) vac_bsearch((void *) &ioffno,
-										(void *) (vp->offsets),
-										vp->offsets_free,
-										sizeof(OffsetNumber),
-										vac_cmp_offno);
-
-	if (voff == NULL)
-		return false;
-
-	/* tid is reaped */
-	return true;
-}
-
-/*
- * Dummy version for scan_index.
- */
-static bool
-dummy_tid_reaped(ItemPointer itemptr, void *state)
-{
-	return false;
-}
-
-/*
- * Update the shared Free Space Map with the info we now have about
- * free space in the relation, discarding any old info the map may have.
- */
-static void
-vac_update_fsm(Relation onerel, VacPageList fraged_pages,
-			   BlockNumber rel_pages)
-{
-	int			nPages = fraged_pages->num_pages;
-	int			i;
-	BlockNumber *pages;
-	Size	   *spaceAvail;
-
-	/* +1 to avoid palloc(0) */
-	pages = (BlockNumber *) palloc((nPages + 1) * sizeof(BlockNumber));
-	spaceAvail = (Size *) palloc((nPages + 1) * sizeof(Size));
-
-	for (i = 0; i < nPages; i++)
-	{
-		pages[i] = fraged_pages->pagedesc[i]->blkno;
-		spaceAvail[i] = fraged_pages->pagedesc[i]->free;
-
-		/*
-		 * fraged_pages may contain entries for pages that we later
-		 * decided to truncate from the relation; don't enter them into
-		 * the map!
-		 */
-		if (pages[i] >= rel_pages)
-		{
-			nPages = i;
-			break;
-		}
-	}
-
-	MultiRecordFreeSpace(&onerel->rd_node,
-						 0, MaxBlockNumber,
-						 nPages, pages, spaceAvail);
-	pfree(pages);
-	pfree(spaceAvail);
-}
-
-/* Copy a VacPage structure */
-static VacPage
-copy_vac_page(VacPage vacpage)
-{
-	VacPage		newvacpage;
-
-	/* allocate a VacPageData entry */
-	newvacpage = (VacPage) palloc(sizeof(VacPageData) +
-						   vacpage->offsets_free * sizeof(OffsetNumber));
-
-	/* fill it in */
-	if (vacpage->offsets_free > 0)
-		memcpy(newvacpage->offsets, vacpage->offsets,
-			   vacpage->offsets_free * sizeof(OffsetNumber));
-	newvacpage->blkno = vacpage->blkno;
-	newvacpage->free = vacpage->free;
-	newvacpage->offsets_used = vacpage->offsets_used;
-	newvacpage->offsets_free = vacpage->offsets_free;
-
-	return newvacpage;
-}
-
-/*
- * Add a VacPage pointer to a VacPageList.
- *
- *		As a side effect of the way that scan_heap works,
- *		higher pages come after lower pages in the array
- *		(and highest tid on a page is last).
- */
-static void
-vpage_insert(VacPageList vacpagelist, VacPage vpnew)
-{
-#define PG_NPAGEDESC 1024
-
-	/* allocate a VacPage entry if needed */
-	if (vacpagelist->num_pages == 0)
-	{
-		vacpagelist->pagedesc = (VacPage *) palloc(PG_NPAGEDESC * sizeof(VacPage));
-		vacpagelist->num_allocated_pages = PG_NPAGEDESC;
-	}
-	else if (vacpagelist->num_pages >= vacpagelist->num_allocated_pages)
-	{
-		vacpagelist->num_allocated_pages *= 2;
-		vacpagelist->pagedesc = (VacPage *) repalloc(vacpagelist->pagedesc, vacpagelist->num_allocated_pages * sizeof(VacPage));
-	}
-	vacpagelist->pagedesc[vacpagelist->num_pages] = vpnew;
-	(vacpagelist->num_pages)++;
-}
-
-/*
- * vac_bsearch: just like standard C library routine bsearch(),
- * except that we first test to see whether the target key is outside
- * the range of the table entries.	This case is handled relatively slowly
- * by the normal binary search algorithm (ie, no faster than any other key)
- * but it occurs often enough in VACUUM to be worth optimizing.
- */
-static void *
-vac_bsearch(const void *key, const void *base,
-			size_t nelem, size_t size,
-			int (*compar) (const void *, const void *))
-{
-	int			res;
-	const void *last;
-
-	if (nelem == 0)
-		return NULL;
-	res = compar(key, base);
-	if (res < 0)
-		return NULL;
-	if (res == 0)
-		return (void *) base;
-	if (nelem > 1)
-	{
-		last = (const void *) ((const char *) base + (nelem - 1) * size);
-		res = compar(key, last);
-		if (res > 0)
-			return NULL;
-		if (res == 0)
-			return (void *) last;
-	}
-	if (nelem <= 2)
-		return NULL;			/* already checked 'em all */
-	return bsearch(key, base, nelem, size, compar);
-}
-
-/*
- * Comparator routines for use with qsort() and bsearch().
- */
-static int
-vac_cmp_blk(const void *left, const void *right)
-{
-	BlockNumber lblk,
-				rblk;
-
-	lblk = (*((VacPage *) left))->blkno;
-	rblk = (*((VacPage *) right))->blkno;
-
-	if (lblk < rblk)
-		return -1;
-	if (lblk == rblk)
-		return 0;
-	return 1;
-}
-
-static int
-vac_cmp_offno(const void *left, const void *right)
-{
-	if (*(OffsetNumber *) left < *(OffsetNumber *) right)
-		return -1;
-	if (*(OffsetNumber *) left == *(OffsetNumber *) right)
-		return 0;
-	return 1;
-}
-
-static int
-vac_cmp_vtlinks(const void *left, const void *right)
-{
-	if (((VTupleLink) left)->new_tid.ip_blkid.bi_hi <
-		((VTupleLink) right)->new_tid.ip_blkid.bi_hi)
-		return -1;
-	if (((VTupleLink) left)->new_tid.ip_blkid.bi_hi >
-		((VTupleLink) right)->new_tid.ip_blkid.bi_hi)
-		return 1;
-	/* bi_hi-es are equal */
-	if (((VTupleLink) left)->new_tid.ip_blkid.bi_lo <
-		((VTupleLink) right)->new_tid.ip_blkid.bi_lo)
-		return -1;
-	if (((VTupleLink) left)->new_tid.ip_blkid.bi_lo >
-		((VTupleLink) right)->new_tid.ip_blkid.bi_lo)
-		return 1;
-	/* bi_lo-es are equal */
-	if (((VTupleLink) left)->new_tid.ip_posid <
-		((VTupleLink) right)->new_tid.ip_posid)
-		return -1;
-	if (((VTupleLink) left)->new_tid.ip_posid >
-		((VTupleLink) right)->new_tid.ip_posid)
-		return 1;
-	return 0;
-}
-
-
-void
-vac_open_indexes(Relation relation, int *nindexes, Relation **Irel)
-{
-	List	   *indexoidlist,
-			   *indexoidscan;
-	int			i;
-
-	indexoidlist = RelationGetIndexList(relation);
-
-	*nindexes = length(indexoidlist);
-
-	if (*nindexes > 0)
-		*Irel = (Relation *) palloc(*nindexes * sizeof(Relation));
-	else
-		*Irel = NULL;
-
-	i = 0;
-	foreach(indexoidscan, indexoidlist)
-	{
-		Oid			indexoid = lfirsti(indexoidscan);
-
-		(*Irel)[i] = index_open(indexoid);
-		i++;
-	}
-
-	freeList(indexoidlist);
-}
-
-
-void
-vac_close_indexes(int nindexes, Relation *Irel)
-{
-	if (Irel == (Relation *) NULL)
-		return;
-
-	while (nindexes--)
-		index_close(Irel[nindexes]);
-	pfree(Irel);
-}
-
-
-/*
- * Is an index partial (ie, could it contain fewer tuples than the heap?)
- */
-bool
-vac_is_partial_index(Relation indrel)
-{
-	/*
-	 * If the index's AM doesn't support nulls, it's partial for our
-	 * purposes
-	 */
-	if (!indrel->rd_am->amindexnulls)
-		return true;
-
-	/* Otherwise, look to see if there's a partial-index predicate */
-	return (VARSIZE(&indrel->rd_index->indpred) > VARHDRSZ);
-}
-
-
-static bool
-enough_space(VacPage vacpage, Size len)
-{
-	len = MAXALIGN(len);
-
-	if (len > vacpage->free)
-		return false;
-
-	/* if there are free itemid(s) and len <= free_space... */
-	if (vacpage->offsets_used < vacpage->offsets_free)
-		return true;
-
-	/* noff_used >= noff_free and so we'll have to allocate new itemid */
-	if (len + sizeof(ItemIdData) <= vacpage->free)
-		return true;
-
-	return false;
-}
-
-
-/*
- * Initialize usage snapshot.
- */
-void
-vac_init_rusage(VacRUsage *ru0)
-{
-	struct timezone tz;
-
-	getrusage(RUSAGE_SELF, &ru0->ru);
-	gettimeofday(&ru0->tv, &tz);
-}
-
-/*
- * Compute elapsed time since ru0 usage snapshot, and format into
- * a displayable string.  Result is in a static string, which is
- * tacky, but no one ever claimed that the Postgres backend is
- * threadable...
- */
-const char *
-vac_show_rusage(VacRUsage *ru0)
-{
-	static char result[100];
-	VacRUsage	ru1;
-
-	vac_init_rusage(&ru1);
-
-	if (ru1.tv.tv_usec < ru0->tv.tv_usec)
-	{
-		ru1.tv.tv_sec--;
-		ru1.tv.tv_usec += 1000000;
-	}
-	if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
-	{
-		ru1.ru.ru_stime.tv_sec--;
-		ru1.ru.ru_stime.tv_usec += 1000000;
-	}
-	if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
-	{
-		ru1.ru.ru_utime.tv_sec--;
-		ru1.ru.ru_utime.tv_usec += 1000000;
-	}
-
-	snprintf(result, sizeof(result),
-			 "CPU %d.%02ds/%d.%02du sec elapsed %d.%02d sec.",
-			 (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
-	  (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
-			 (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
-	  (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
-			 (int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
-			 (int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
-
-	return result;
-}