create sequence s1;
create view v1 as select * from s1;
create view v2 as select next value for s1;
select * from v1;
next_not_cached_value	minimum_value	maximum_value	start_value	increment	cache_size	cycle_option	cycle_count
1	1	9223372036854775806	1	1	1000	0	0
select * from v2;
next value for s1
1
select * from v2;
next value for s1
2
select next value for v1;
ERROR 42S02: 'test.v1' is not a SEQUENCE
drop sequence s1;
drop view v1,v2;
#
# MDEV 13020 Server crashes in Item_func_nextval::val_int upon
# selecting NEXT or PREVIOUS VALUE for a view
#
CREATE OR REPLACE VIEW v1 AS SELECT 1 AS f;
SELECT NEXT VALUE FOR v1;
ERROR 42S02: 'test.v1' is not a SEQUENCE
SELECT PREVIOUS VALUE FOR v1;
ERROR 42S02: 'test.v1' is not a SEQUENCE
drop view v1;
#
# MDEV 17978 Server crashes in mysqld_show_create_get_fields
# upon SHOW CREATE SEQUENCE on a broken view
#
CREATE TABLE t1 (a INT);
CREATE VIEW v1 AS SELECT * FROM t1;
DROP TABLE t1;
SHOW CREATE SEQUENCE v1;
ERROR 42S02: 'test.v1' is not a SEQUENCE
DROP VIEW v1;