Hi, Nikita!
On Nov 15, Nikita Malyavin wrote:
> revision-id: 9277b838aad (mariadb-10.5.2-485-g9277b838aad)
> parent(s): 37b6f5cb8ef
> author: Nikita Malyavin
> committer: Nikita Malyavin
> timestamp: 2021-01-29 03:47:52 +1000
> message:
>
> Forbid savepoints setup while ONLINE ALTER goes on
Why is that?
Well, in short, it's not implemented. If rollback to savepoint is happened, we should rollback in our transaction cache as well.
Then we need to remember where the savepoint is, for every online altering table.
It likely resolves with maintaining a hash Savepoint -> List [ <table, offset> ]
But now rollback would sole an effect after ALTER TABLE is finished