crash in st_key::actual_rec_per_key when group by constant

Version: '10.1.11-MariaDB'  mariadb.org binary distribution

[ERROR] mysqld got exception 0xc0000005 ;

mysqld.exe!st_key::actual_rec_per_key()[table.cc:7416]

mysqld.exe!cost_group_min_max()[opt_range.cc:13114]

mysqld.exe!get_best_group_min_max()[opt_range.cc:12478]

mysqld.exe!SQL_SELECT::test_quick_select()[opt_range.cc:2562]

mysqld.exe!get_quick_record_count()[sql_select.cc:3490]

mysqld.exe!make_join_statistics()[sql_select.cc:4108]

mysqld.exe!JOIN::optimize_inner()[sql_select.cc:1375]

mysqld.exe!JOIN::optimize()[sql_select.cc:1036]

mysqld.exe!mysql_select()[sql_select.cc:3437]

mysqld.exe!handle_select()[sql_select.cc:384]

mysqld.exe!execute_sqlcom_select()[sql_parse.cc:5903]

mysqld.exe!mysql_execute_command()[sql_parse.cc:2962]

mysqld.exe!mysql_parse()[sql_parse.cc:7308]

mysqld.exe!dispatch_command()[sql_parse.cc:1491]

mysqld.exe!do_command()[sql_parse.cc:1109]

mysqld.exe!threadpool_process_request()[threadpool_common.cc:239]

mysqld.exe!io_completion_callback()[threadpool_win.cc:568]

drop table if exists t;

create table t (a date not null,unique (a)) engine=innodb;

select distinct a from t group by 'a';