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/*-------------------------------------------------------------------------
*
* rewriteheap.h
* Declarations for heap rewrite support functions
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* src/include/access/rewriteheap.h
*
*-------------------------------------------------------------------------
*/
#ifndef REWRITE_HEAP_H
#define REWRITE_HEAP_H
#include "access/htup.h"
#include "storage/itemptr.h"
#include "storage/relfilelocator.h"
#include "utils/relcache.h"
/* struct definition is private to rewriteheap.c */
typedef struct RewriteStateData *RewriteState;
extern RewriteState begin_heap_rewrite(Relation old_heap, Relation new_heap,
TransactionId oldest_xmin, TransactionId freeze_xid,
MultiXactId cutoff_multi);
extern void end_heap_rewrite(RewriteState state);
extern void rewrite_heap_tuple(RewriteState state, HeapTuple old_tuple,
HeapTuple new_tuple);
extern bool rewrite_heap_dead_tuple(RewriteState state, HeapTuple old_tuple);
/*
* On-Disk data format for an individual logical rewrite mapping.
*/
typedef struct LogicalRewriteMappingData
{
RelFileLocator old_locator;
RelFileLocator new_locator;
ItemPointerData old_tid;
ItemPointerData new_tid;
} LogicalRewriteMappingData;
/* ---
* The filename consists of the following, dash separated,
* components:
* 1) database oid or InvalidOid for shared relations
* 2) the oid of the relation
* 3) upper 32bit of the LSN at which a rewrite started
* 4) lower 32bit of the LSN at which a rewrite started
* 5) xid we are mapping for
* 6) xid of the xact performing the mapping
* ---
*/
#define LOGICAL_REWRITE_FORMAT "map-%x-%x-%X_%X-%x-%x"
extern void CheckPointLogicalRewriteHeap(void);
#endif /* REWRITE_HEAP_H */
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