Unexpected behavior in REPEAT functions.

drop table if exists t1;

create table t1 (vkey int, pkey int);

insert into t1 values (5, 15000);

insert into t1 values (28, 38000);

select (REPEAT(REPEAT(case when false then ('o#W4O') else ('o#W4O') end , ref_0.vkey), ref_0.pkey)) >= 'i'  as c_0 from t1 as ref_0;

+------+

| c_0  |

+------+

|    1 |

|    1 |

+------+

2 rows in set (0.00 sec)

select  *   from  t1 as ref_0

where (REPEAT(REPEAT(case when false then ('o#W4O') else ('o#W4O') end , ref_0.vkey), ref_0.pkey)) >= 'i';

+------+-------+

| vkey | pkey  |

+------+-------+

|    5 | 15000 |

+------+-------+

1 row in set, 1 warning (0.00 sec)