Use RangeVarGetRelidExtended() in AlterSequence()

This allows us to combine the opening and the ownership check.
Reported-by: Robert Haas <robertmhaas@gmail.com>

src/backend/commands/sequence.c

@@ -429,10 +429,13 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 	HeapTuple	seqtuple;
 	HeapTuple	newdatatuple;
 
-	/* Open and lock sequence. */
-	relid = RangeVarGetRelid(stmt->sequence,
-							 ShareRowExclusiveLock,
-							 stmt->missing_ok);
+	/* Open and lock sequence, and check for ownership along the way. */
+	relid = RangeVarGetRelidExtended(stmt->sequence,
+									 ShareRowExclusiveLock,
+									 stmt->missing_ok,
+									 false,
+									 RangeVarCallbackOwnsRelation,
+									 NULL);
 	if (relid == InvalidOid)
 	{
 		ereport(NOTICE,
@@ -443,11 +446,6 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 
 	init_sequence(relid, &elm, &seqrel);
 
-	/* allow ALTER to sequence owner only */
-	if (!pg_class_ownercheck(relid, GetUserId()))
-		aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_CLASS,
-					   stmt->sequence->relname);
-
 	rel = heap_open(SequenceRelationId, RowExclusiveLock);
 	seqtuple = SearchSysCacheCopy1(SEQRELID,
 								   ObjectIdGetDatum(relid));

src/test/regress/expected/sequence.out

@@ -307,8 +307,8 @@ DROP SEQUENCE myseq2;
 ALTER SEQUENCE IF EXISTS sequence_test2 RESTART WITH 24
   INCREMENT BY 4 MAXVALUE 36 MINVALUE 5 CYCLE;
 NOTICE:  relation "sequence_test2" does not exist, skipping
-ALTER SEQUENCE pg_class CYCLE;  -- error, not a sequence
-ERROR:  "pg_class" is not a sequence
+ALTER SEQUENCE serialTest1 CYCLE;  -- error, not a sequence
+ERROR:  "serialtest1" is not a sequence
 CREATE SEQUENCE sequence_test2 START WITH 32;
 CREATE SEQUENCE sequence_test4 INCREMENT BY -1;
 SELECT nextval('sequence_test2');

src/test/regress/sql/sequence.sql

@@ -172,7 +172,7 @@ DROP SEQUENCE myseq2;
 ALTER SEQUENCE IF EXISTS sequence_test2 RESTART WITH 24
   INCREMENT BY 4 MAXVALUE 36 MINVALUE 5 CYCLE;
 
-ALTER SEQUENCE pg_class CYCLE;  -- error, not a sequence
+ALTER SEQUENCE serialTest1 CYCLE;  -- error, not a sequence
 
 CREATE SEQUENCE sequence_test2 START WITH 32;
 CREATE SEQUENCE sequence_test4 INCREMENT BY -1;