Mariabackup does not work with MyISAM tables with vector keys

--source include/have_innodb.inc

create or replace table t (a int, v vector(1) not null, vector(v)) engine=MyISAM;

insert into t values (1,0x31313131),(2,0x32323232);

--echo # Running backup

--exec $XTRABACKUP --backup --target-dir=$MYSQL_TMP_DIR/mbackup_backup --socket=$MASTER_MYSOCK --user=root > $MYSQL_TMP_DIR/mbackup.log 2>&1

--echo # Running prepare

--exec $XTRABACKUP --prepare --target-dir=$MYSQL_TMP_DIR/mbackup_backup > $MYSQL_TMP_DIR/mprepare.log 2>&1

--echo # Running restore

--exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --copy-back --datadir=$MYSQL_TMP_DIR/mbackup_restore --target-dir=$MYSQL_TMP_DIR/mbackup_backup > $MYSQL_TMP_DIR/mrestore.log 2>&1

--echo # Restarting on the restored datadir

--let $restart_parameters= --datadir=$MYSQL_TMP_DIR/mbackup_restore

--list_files $MYSQL_TMP_DIR/mbackup_restore/test/

--source include/restart_mysqld.inc

select * from t order by vec_distance_euclidean(v,0x30303030) limit 1;

check table t extended;

repair table t;

# Cleanup

drop table t;

$ grep -A 2 -B 2 ERROR var/tmp/mbackup.log 

[00] 2024-10-25 18:11:50 Collect log table file: ./mysql/slow_log.CSM

[00] 2024-10-25 18:11:50 Collect log table file: ./mysql/slow_log.CSV

2024-10-25 18:11:50 0 [ERROR] Invalid (old?) table or database name 't#i#00'

2024-10-25 18:11:50 0 [ERROR] Invalid (old?) table or database name 't#i#00'

[00] 2024-10-25 18:11:50 Stop scanning common engine tables

[00] 2024-10-25 18:11:50 Start copying aria log file tail: /mnt8t/bld/preview-11.7-bb-11.6-MDEV-32887-vector-rel/mysql-test/var/mysqld.1/data//aria_log.00000001

--

[00] 2024-10-25 18:11:50 aria table file ./mysql/help_topic.MAD is copied successfully.

[00] 2024-10-25 18:11:50 Start scanning common engine tables, need backup locks: 1, collect log and stat tables: 0

2024-10-25 18:11:50 0 [ERROR] Invalid (old?) table or database name 't#i#00'

[00] 2024-10-25 18:11:50 Skip table test.#mysql50#t#i#00 at it is in exclude list

2024-10-25 18:11:50 0 [ERROR] Invalid (old?) table or database name 't#i#00'

[00] 2024-10-25 18:11:50 Skip table test.#mysql50#t#i#00 at it is in exclude list

[00] 2024-10-25 18:11:50 Skip table test.t at it is in exclude list

# Restarting on the restored datadir

db.opt

t.MYD

t.MYI

t.frm

# restart: --datadir=MYSQLTEST_VARDIR/tmp/mbackup_restore

select * from t order by vec_distance_euclidean(v,0x30303030) limit 1;

mysqltest: At line 17: query 'select * from t order by vec_distance_euclidean(v,0x30303030) limit 1' failed: ER_FILE_NOT_FOUND (1017): Can't find file: './test/t#i#00.MYI' (errno: 2 "No such file or directory")

check table t extended;

Table	Op	Msg_type	Msg_text

test.t	check	Error	Can't find file: './test/t#i#00.MYI' (errno: 2 "No such file or directory")

test.t	check	status	Operation failed

repair table t;