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db_include/access/rewriteheap.h

@@ -0,0 +1,57 @@
+/*-------------------------------------------------------------------------
+ *
+ * rewriteheap.h
+ *	  Declarations for heap rewrite support functions
+ *
+ * Portions Copyright (c) 1996-2021, 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/relfilenode.h"
+#include "utils/relcache.h"
+
+/* struct definition is private to rewriteheap.c */
+typedef struct RewriteStateData *RewriteState;
+
+extern RewriteState begin_heap_rewrite(Relation OldHeap, Relation NewHeap,
+									   TransactionId OldestXmin, TransactionId FreezeXid,
+									   MultiXactId MultiXactCutoff);
+extern void end_heap_rewrite(RewriteState state);
+extern void rewrite_heap_tuple(RewriteState state, HeapTuple oldTuple,
+							   HeapTuple newTuple);
+extern bool rewrite_heap_dead_tuple(RewriteState state, HeapTuple oldTuple);
+
+/*
+ * On-Disk data format for an individual logical rewrite mapping.
+ */
+typedef struct LogicalRewriteMappingData
+{
+	RelFileNode old_node;
+	RelFileNode new_node;
+	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"
+void		CheckPointLogicalRewriteHeap(void);
+
+#endif							/* REWRITE_HEAP_H */