New user experience product challenges

Product

• alter table engine=columnstore
  We should stop/warn customer if trying to run on a table > 500 rows, else it takes an eternity or make it actually performant
  https://jira.mariadb.org/browse/MCOL-5907

• Backups / Restore ( physical and logical )
  cmapi wrapper of backup/restore not done, much less public facing docs on how to run
  cmapi even for single nodes

• columnstore doesnt warn or have a dependancy for the cmapi package, even though you need it since 23.02.4+, prospect was using without cmapi for a month+
  unclear mariadb-columnstore systemd unit masking, cant start columnstore once cmapi installed but not configured, leading customer to think someone is wrong but not what ERROR 1815 (HY000) : Internal error: DBRM is not responding. Cannot accent queries

• mcsRebuildEM not working
  Rebuild EM: rw-rr- 1 root root 1080428 Oct 24 12:13 BRM_saves_em - why does it even leave it owned by root, and its size is almost double that the original
  Prior EM from october 18th: rw-rr- 1 mysql mysql 585260 Oct 18 10:06 BRM_saves_em
  resulting in error AL0000: Invalid Range from HWM for lbid 37924864, range size should be <= blocksReadAhead: HWM 0, dbroot 1, highfbo 10751, lowfbo 10240, blocksReadAhead 512, range size -10239#012 %%10%% after startup and trying to query using the rebuilt em