diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index ca22efd..9d2f6b7 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -613,6 +613,17 @@ static const struct cachedesc cacheinfo[] = {
 		},
 		1024
 	},
+	{RelationRelationId,		/* RELFILENODE */
+		ClassTblspcRelfilenodeIndexId,
+		2,
+		{
+			Anum_pg_class_reltablespace,
+			Anum_pg_class_relfilenode,
+			0,
+			0
+		},
+		1024
+	},
 	{RewriteRelationId,			/* RULERELNAME */
 		RewriteRelRulenameIndexId,
 		2,
diff --git a/src/include/catalog/indexing.h b/src/include/catalog/indexing.h
index 238fe58..c0a9339 100644
--- a/src/include/catalog/indexing.h
+++ b/src/include/catalog/indexing.h
@@ -106,6 +106,8 @@ DECLARE_UNIQUE_INDEX(pg_class_oid_index, 2662, on pg_class using btree(oid oid_o
 #define ClassOidIndexId  2662
 DECLARE_UNIQUE_INDEX(pg_class_relname_nsp_index, 2663, on pg_class using btree(relname name_ops, relnamespace oid_ops));
 #define ClassNameNspIndexId  2663
+DECLARE_INDEX(pg_class_tblspc_relfilenode_index, 2844, on pg_class using btree(reltablespace oid_ops, relfilenode oid_ops));
+#define ClassTblspcRelfilenodeIndexId  2844
 
 DECLARE_UNIQUE_INDEX(pg_collation_name_enc_nsp_index, 3164, on pg_collation using btree(collname name_ops, collencoding int4_ops, collnamespace oid_ops));
 #define CollationNameEncNspIndexId 3164
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index 77a3b41..d88248a 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -4667,6 +4667,7 @@ DATA(insert OID = 3473 (  spg_range_quad_leaf_consistent	PGNSP PGUID 12 1 0 0 0
 DESCR("SP-GiST support for quad tree over range");
 
 
+
 /*
  * Symbolic values for provolatile column: these indicate whether the result
  * of a function is dependent *only* on the values of its explicit arguments,
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index d1a9855..9a39077 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -77,6 +77,7 @@ enum SysCacheIdentifier
 	RANGETYPE,
 	RELNAMENSP,
 	RELOID,
+	RELFILENODE,
 	RULERELNAME,
 	STATRELATTINH,
 	TABLESPACEOID,