(In reply to Jiri Slaby from comment #10) > So it might be that the only problem is that no error (max key length is > 3072 bytes) is emitted and the table is miscreated. No, support for > 3072 was added to mariadb in 10.5 via: https://jira.mariadb.org/browse/MDEV-371 So it's likely a bug in the hashing over the virtual table.