[SUPPORT] Questions about the rollback mechanism of the MOR table

[Zouxxyy]

I'm a hudi beginner and have some questions and hope to get answers ^_^

1. I would like to know if my understanding of the MOR table rollback mechanism is correct:
   The rollback logic of the MOR table is to add a new log, which records the rollback log, and hudi will not merge the log marked as rollback in the subsequent compaction

2. Why not just delete the log that needs rollback, Wouldn't it be more convenient? (just like COW table, delete the parquet that needs rollback)

Thank you very much！