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diff --git a/src/include/utils/relcache.h b/src/include/utils/relcache.h
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+/*-------------------------------------------------------------------------
+ *
+ * relcache.h
+ *	  Relation descriptor cache definitions.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/relcache.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef RELCACHE_H
+#define RELCACHE_H
+
+#include "access/tupdesc.h"
+#include "nodes/bitmapset.h"
+
+
+/*
+ * Name of relcache init file(s), used to speed up backend startup
+ */
+#define RELCACHE_INIT_FILENAME	"pg_internal.init"
+
+typedef struct RelationData *Relation;
+
+/* ----------------
+ *		RelationPtr is used in the executor to support index scans
+ *		where we have to keep track of several index relations in an
+ *		array.  -cim 9/10/89
+ * ----------------
+ */
+typedef Relation *RelationPtr;
+
+/*
+ * Routines to open (lookup) and close a relcache entry
+ */
+extern Relation RelationIdGetRelation(Oid relationId);
+extern void RelationClose(Relation relation);
+
+/*
+ * Routines to compute/retrieve additional cached information
+ */
+extern List *RelationGetFKeyList(Relation relation);
+extern List *RelationGetIndexList(Relation relation);
+extern List *RelationGetStatExtList(Relation relation);
+extern Oid	RelationGetPrimaryKeyIndex(Relation relation);
+extern Oid	RelationGetReplicaIndex(Relation relation);
+extern List *RelationGetIndexExpressions(Relation relation);
+extern List *RelationGetDummyIndexExpressions(Relation relation);
+extern List *RelationGetIndexPredicate(Relation relation);
+extern Datum *RelationGetIndexRawAttOptions(Relation relation);
+extern bytea **RelationGetIndexAttOptions(Relation relation, bool copy);
+
+typedef enum IndexAttrBitmapKind
+{
+	INDEX_ATTR_BITMAP_ALL,
+	INDEX_ATTR_BITMAP_KEY,
+	INDEX_ATTR_BITMAP_PRIMARY_KEY,
+	INDEX_ATTR_BITMAP_IDENTITY_KEY
+} IndexAttrBitmapKind;
+
+extern Bitmapset *RelationGetIndexAttrBitmap(Relation relation,
+											 IndexAttrBitmapKind attrKind);
+
+extern Bitmapset *RelationGetIdentityKeyBitmap(Relation relation);
+
+extern void RelationGetExclusionInfo(Relation indexRelation,
+									 Oid **operators,
+									 Oid **procs,
+									 uint16 **strategies);
+
+extern void RelationInitIndexAccessInfo(Relation relation);
+
+/* caller must include pg_publication.h */
+struct PublicationActions;
+extern struct PublicationActions *GetRelationPublicationActions(Relation relation);
+
+extern void RelationInitTableAccessMethod(Relation relation);
+
+/*
+ * Routines to support ereport() reports of relation-related errors
+ */
+extern int	errtable(Relation rel);
+extern int	errtablecol(Relation rel, int attnum);
+extern int	errtablecolname(Relation rel, const char *colname);
+extern int	errtableconstraint(Relation rel, const char *conname);
+
+/*
+ * Routines for backend startup
+ */
+extern void RelationCacheInitialize(void);
+extern void RelationCacheInitializePhase2(void);
+extern void RelationCacheInitializePhase3(void);
+
+/*
+ * Routine to create a relcache entry for an about-to-be-created relation
+ */
+extern Relation RelationBuildLocalRelation(const char *relname,
+										   Oid relnamespace,
+										   TupleDesc tupDesc,
+										   Oid relid,
+										   Oid accessmtd,
+										   Oid relfilenode,
+										   Oid reltablespace,
+										   bool shared_relation,
+										   bool mapped_relation,
+										   char relpersistence,
+										   char relkind);
+
+/*
+ * Routines to manage assignment of new relfilenode to a relation
+ */
+extern void RelationSetNewRelfilenode(Relation relation, char persistence);
+extern void RelationAssumeNewRelfilenode(Relation relation);
+
+/*
+ * Routines for flushing/rebuilding relcache entries in various scenarios
+ */
+extern void RelationForgetRelation(Oid rid);
+
+extern void RelationCacheInvalidateEntry(Oid relationId);
+
+extern void RelationCacheInvalidate(bool debug_discard);
+
+extern void RelationCloseSmgrByOid(Oid relationId);
+
+#ifdef USE_ASSERT_CHECKING
+extern void AssertPendingSyncs_RelationCache(void);
+#else
+#define AssertPendingSyncs_RelationCache() do {} while (0)
+#endif
+extern void AtEOXact_RelationCache(bool isCommit);
+extern void AtEOSubXact_RelationCache(bool isCommit, SubTransactionId mySubid,
+									  SubTransactionId parentSubid);
+
+/*
+ * Routines to help manage rebuilding of relcache init files
+ */
+extern bool RelationIdIsInInitFile(Oid relationId);
+extern void RelationCacheInitFilePreInvalidate(void);
+extern void RelationCacheInitFilePostInvalidate(void);
+extern void RelationCacheInitFileRemove(void);
+
+/* should be used only by relcache.c and catcache.c */
+extern bool criticalRelcachesBuilt;
+
+/* should be used only by relcache.c and postinit.c */
+extern bool criticalSharedRelcachesBuilt;
+
+#endif							/* RELCACHE_H */