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diff --git a/src/include/replication/logicalrelation.h b/src/include/replication/logicalrelation.h
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+++ b/src/include/replication/logicalrelation.h
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+/*-------------------------------------------------------------------------
+ *
+ * logicalrelation.h
+ *	  Relation definitions for logical replication relation mapping.
+ *
+ * Portions Copyright (c) 2016-2021, PostgreSQL Global Development Group
+ *
+ * src/include/replication/logicalrelation.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef LOGICALRELATION_H
+#define LOGICALRELATION_H
+
+#include "access/attmap.h"
+#include "replication/logicalproto.h"
+
+typedef struct LogicalRepRelMapEntry
+{
+	LogicalRepRelation remoterel;	/* key is remoterel.remoteid */
+
+	/*
+	 * Validity flag -- when false, revalidate all derived info at next
+	 * logicalrep_rel_open.  (While the localrel is open, we assume our lock
+	 * on that rel ensures the info remains good.)
+	 */
+	bool		localrelvalid;
+
+	/* Mapping to local relation. */
+	Oid			localreloid;	/* local relation id */
+	Relation	localrel;		/* relcache entry (NULL when closed) */
+	AttrMap    *attrmap;		/* map of local attributes to remote ones */
+	bool		updatable;		/* Can apply updates/deletes? */
+
+	/* Sync state. */
+	char		state;
+	XLogRecPtr	statelsn;
+} LogicalRepRelMapEntry;
+
+extern void logicalrep_relmap_update(LogicalRepRelation *remoterel);
+extern void logicalrep_partmap_reset_relmap(LogicalRepRelation *remoterel);
+
+extern LogicalRepRelMapEntry *logicalrep_rel_open(LogicalRepRelId remoteid,
+												  LOCKMODE lockmode);
+extern LogicalRepRelMapEntry *logicalrep_partition_open(LogicalRepRelMapEntry *root,
+														Relation partrel, AttrMap *map);
+extern void logicalrep_rel_close(LogicalRepRelMapEntry *rel,
+								 LOCKMODE lockmode);
+
+#endif							/* LOGICALRELATION_H */