Comments - Delete failed, several errors
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Please review troubleshooting steps here: https://mariadb.com/kb/en/mariadb/system-troubleshooting-mariadb-columnstore/
You may be hitting a number of issues. You could also file a jira with the output of columnstoreSupport and we can review for issues if you are still reproducing these.
Depending on what you are doing you should look into partition based drops since you appear to have time based data: https://mariadb.com/kb/en/mariadb/columnstore-partition-management/ That is the best way to do large scale deletes and will reclaim disk space.