As far as I knew, after performing DDL(add column), there is no rollback process in MemSQL. And DDL does also not abort after DDL performed.
However, we have seen that DDL can be aborted immediately with Ctrl^C after performing DDL.
At this time, the status of DDL was ‘PREPARE’.
How long does the PREPARE status last?
How MemSQL is working internally in the PREPARE status.
The purpose of question is to check the exact time to execute the rollback against the incorrect DDL.