Plans for SELECT and DELETE from view unexpectedly differ

create table t1 (c1 integer, c2 integer, c3 integer);

insert into t1(c1,c2,c3)

        values (1,1,1),(1,2,2),(1,3,3),

               (2,1,4),(2,2,5),(2,3,6),

               (2,4,7),(2,5,8);

insert into t1 select c1+10,c2,c3+10 from t1;

insert into t1 select c1+20,c2+1,c3+20 from t1;

create view v1 as select * from t1 where c2=2;

analyze table t1 persistent for all;

let $c = v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)

          and c1 = 2

          and exists (select 'X' from v1 a where a.c1 = v1.c1);

eval explain select * from v1 where $c;

eval explain delete from v1 where $c;

drop view v1;

drop table t1;

explain select * from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)

and c1 = 2

and exists (select 'X' from v1 a where a.c1 = v1.c1);

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where

1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where; FirstMatch(t1); Using join buffer (flat, BNL join)

2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using where

explain delete from v1 where v1.c2 in (select max(a.c2) from t1 a where a.c3 = v1.c3)

and c1 = 2

and exists (select 'X' from v1 a where a.c1 = v1.c1);

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where

3	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	32	Using where

2	DEPENDENT SUBQUERY	a	ALL	NULL	NULL	NULL	NULL	32	Using wher