ALTER performs vector truncation without WARN_DATA_TRUNCATED or similar warnings/errors

create table t (v vector(2));

insert into t values (0x3131313132323232);

select * from t;

alter table t modify v vector(1);

select * from t;

# Cleanup

drop table t;

create table t (v vector(2));

insert into t values (0x3131313132323232);

select * from t;

v

11112222

alter table t modify v vector(1);

select * from t;

v

1111

create table t (v binary(8));

insert into t values (0x3131313132323232);

select * from t;

v

11112222

alter table t modify v binary(4);

bug.t                                    [ fail ]

        Test ended at 2024-10-31 23:41:15

CURRENT_TEST: bug.t

mysqltest: At line 4: query 'alter table t modify v binary(4)' failed: WARN_DATA_TRUNCATED (1265): Data truncated for column 'v' at row 1

set sql_mode='';

alter table t modify v binary(4);

Warnings:

Warning	1265	Data truncated for column 'v' at row 1

select * from t;

v

1111