Vector datatype returns in protocol as VAR_STRING without vector hints

MariaDB [test]> select * from my_vector;

Field   1:  `a`

Org_field:  `a`

Catalog:    `def`

Database:   `test`

Table:      `my_vector`

Org_table:  `my_vector`

Type:       VAR_STRING

Collation:  binary (63)

Length:     16

Max_length: 16

Decimals:   0

Flags:      BINARY 

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

| a                |

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

|   �?�̌?���?ff�?        |

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

1 row in set (0.001 sec)

    float f1[4] = {1.0f, 1.1f, 1.2f, 1.3f};

    float f2[4] = {0.0};

...

    rc= mysql_stmt_prepare(stmt, SL("SELECT a FROM my_vector"));

    check_stmt_rc(rc, stmt);

    rc= mysql_stmt_execute(stmt);

    check_stmt_rc(rc, stmt);

    memset(&bind, 0, sizeof(MYSQL_BIND));

    bind.buffer= &f2;

    bind.buffer_length= sizeof(float) * 4;

    rc= mysql_stmt_bind_result(stmt, &bind);

    check_stmt_rc(rc, stmt);

    rc= mysql_stmt_fetch(stmt);

    check_stmt_rc(rc, stmt);

    mysql_stmt_close(stmt);

    if (memcmp(f1, f2, sizeof(float) * 4))