Make more use of RELKIND_HAS_STORAGE()

Make use of RELKIND_HAS_STORAGE() where appropriate, instead of
listing out the relkinds individually.  No behavior change intended.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/7a22bf51-2480-d999-1794-191ba67ff47c%402ndquadrant.com

src/backend/catalog/heap.c

@@ -1943,13 +1943,8 @@ heap_drop_with_catalog(Oid relid)
 	/*
 	 * Schedule unlinking of the relation's physical files at commit.
 	 */
-	if (rel->rd_rel->relkind != RELKIND_VIEW &&
-		rel->rd_rel->relkind != RELKIND_COMPOSITE_TYPE &&
-		rel->rd_rel->relkind != RELKIND_FOREIGN_TABLE &&
-		rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE)
-	{
+	if (RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
 		RelationDropStorage(rel);
-	}
 
 	/*
 	 * Close relcache entry, but *keep* AccessExclusiveLock on the relation

src/backend/postmaster/pgstat.c

@@ -1807,11 +1807,7 @@ pgstat_initstats(Relation rel)
 	char		relkind = rel->rd_rel->relkind;
 
 	/* We only count stats for things that have storage */
-	if (!(relkind == RELKIND_RELATION ||
-		  relkind == RELKIND_MATVIEW ||
-		  relkind == RELKIND_INDEX ||
-		  relkind == RELKIND_TOASTVALUE ||
-		  relkind == RELKIND_SEQUENCE))
+	if (!RELKIND_HAS_STORAGE(relkind))
 	{
 		rel->pgstat_info = NULL;
 		return;

src/backend/utils/adt/dbsize.c

@@ -874,25 +874,18 @@ pg_relation_filenode(PG_FUNCTION_ARGS)
 		PG_RETURN_NULL();
 	relform = (Form_pg_class) GETSTRUCT(tuple);
 
-	switch (relform->relkind)
+	if (RELKIND_HAS_STORAGE(relform->relkind))
 	{
-		case RELKIND_RELATION:
-		case RELKIND_MATVIEW:
-		case RELKIND_INDEX:
-		case RELKIND_SEQUENCE:
-		case RELKIND_TOASTVALUE:
-			/* okay, these have storage */
-			if (relform->relfilenode)
-				result = relform->relfilenode;
-			else				/* Consult the relation mapper */
-				result = RelationMapOidToFilenode(relid,
-												  relform->relisshared);
-			break;
-
-		default:
-			/* no storage, return NULL */
-			result = InvalidOid;
-			break;
+		if (relform->relfilenode)
+			result = relform->relfilenode;
+		else				/* Consult the relation mapper */
+			result = RelationMapOidToFilenode(relid,
+											  relform->relisshared);
+	}
+	else
+	{
+		/* no storage, return NULL */
+		result = InvalidOid;
 	}
 
 	ReleaseSysCache(tuple);
@@ -951,38 +944,30 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 		PG_RETURN_NULL();
 	relform = (Form_pg_class) GETSTRUCT(tuple);
 
-	switch (relform->relkind)
+	if (RELKIND_HAS_STORAGE(relform->relkind))
+	{
+		/* This logic should match RelationInitPhysicalAddr */
+		if (relform->reltablespace)
+			rnode.spcNode = relform->reltablespace;
+		else
+			rnode.spcNode = MyDatabaseTableSpace;
+		if (rnode.spcNode == GLOBALTABLESPACE_OID)
+			rnode.dbNode = InvalidOid;
+		else
+			rnode.dbNode = MyDatabaseId;
+		if (relform->relfilenode)
+			rnode.relNode = relform->relfilenode;
+		else				/* Consult the relation mapper */
+			rnode.relNode = RelationMapOidToFilenode(relid,
+													 relform->relisshared);
+	}
+	else
 	{
-		case RELKIND_RELATION:
-		case RELKIND_MATVIEW:
-		case RELKIND_INDEX:
-		case RELKIND_SEQUENCE:
-		case RELKIND_TOASTVALUE:
-			/* okay, these have storage */
-
-			/* This logic should match RelationInitPhysicalAddr */
-			if (relform->reltablespace)
-				rnode.spcNode = relform->reltablespace;
-			else
-				rnode.spcNode = MyDatabaseTableSpace;
-			if (rnode.spcNode == GLOBALTABLESPACE_OID)
-				rnode.dbNode = InvalidOid;
-			else
-				rnode.dbNode = MyDatabaseId;
-			if (relform->relfilenode)
-				rnode.relNode = relform->relfilenode;
-			else				/* Consult the relation mapper */
-				rnode.relNode = RelationMapOidToFilenode(relid,
-														 relform->relisshared);
-			break;
-
-		default:
 			/* no storage, return NULL */
 			rnode.relNode = InvalidOid;
 			/* some compilers generate warnings without these next two lines */
 			rnode.dbNode = InvalidOid;
 			rnode.spcNode = InvalidOid;
-			break;
 	}
 
 	if (!OidIsValid(rnode.relNode))