admin_user@54321:ppatests_db=# create sequence wtf;
CREATE SEQUENCE

admin_user@54321:ppatests_db=# select
pg_catalog.pg_sequence_last_value(c.oid::regclass),
pg_catalog.has_sequence_privilege(c.oid, 'SELECT,USAGE'::text)
from pg_class c where relname='wtf';
 pg_sequence_last_value | has_sequence_privilege
------------------------+------------------------
                        | t
(1 row)

admin_user@54321:ppatests_db=# select * from wtf;
last_value | log_cnt | is_called
------------+---------+-----------
          1 |       0 | f
(1 row)

/*
if (pg_class_aclcheck(relid, GetUserId(), ACL_SELECT | ACL_USAGE) != ACLCHECK_OK)
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("permission denied for sequence %s",
						RelationGetRelationName(seqrel))));

	seq = read_seq_tuple(elm, seqrel, &buf, &seqtuple);

	is_called = seq->is_called;
	result = seq->last_value;
*/